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Difference between revisions of "Light"

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===About Light and Dark===
 
===About Light and Dark===
 
: '''Light''' can be very bright or it can be very '''dark'''.
 
: '''Light''' can be very bright or it can be very '''dark'''.
−
: When '''light''' is very bright it can hurt our eyes. '''Light''' from the sun is very bright and we shouldn't look at the sun because it can cause people to go blind.
+
: '''Light''' travels in straight lines.
 +
: '''Light''' comes from [[luminous]] objects and is [[reflected]] off non-luminous objects. [[The Sun]] can be seen because it is [[luminous]]. [[The Moon]] can be seen because it [[reflect]]s the '''light''' of [[The Sun]].
 +
: When '''light''' is very bright it can hurt our eyes. '''Light''' from [[The Sun]] is very bright and we shouldn't look at [[The Sun]] because it can cause people to go blind.
 
: When there is not enough light to see we say it is '''dark'''. At night time it is very '''dark''' which is why it is hard to see.
 
: When there is not enough light to see we say it is '''dark'''. At night time it is very '''dark''' which is why it is hard to see.
  
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==Key Stage 3==
 
==Key Stage 3==
 
===Meaning===
 
===Meaning===
−
[[Light]] is a [[wave]] that transfers [[energy]] and [[information]].
+
[[Light]] is a [[wave]] that [[human]]s can see with their [[eye]]s.
  
 
===About Light===
 
===About Light===
Line 27: Line 29:
 
*[[Transmit|Transmitted]] - [[Light]] can pass through a [[medium]].
 
*[[Transmit|Transmitted]] - [[Light]] can pass through a [[medium]].
 
*[[Absorb (physics)|Absorbed]] - The [[energy]] [[Energy Transfer|transferred]] by [[light]] can be taken in by an [[opaque]] [[material]].
 
*[[Absorb (physics)|Absorbed]] - The [[energy]] [[Energy Transfer|transferred]] by [[light]] can be taken in by an [[opaque]] [[material]].
−
*[[Reflection|Reflected]] - [[Light]] can bounce of a surface. This can be either [[Diffuse Reflection]] or [[Specular Reflection]].
+
*[[Reflection|Reflected]] - [[Light]] can bounce off a surface. This can be either [[Diffuse Reflection]] or [[Specular Reflection]].
 
*[[Refraction|Refracted]] - [[Light]] can change direction when it changes [[medium]].
 
*[[Refraction|Refracted]] - [[Light]] can change direction when it changes [[medium]].
 
===Medium===
 
===Medium===
−
: [[Light]] can travel through a [[transparent]] [[medium]] but it does not need a [[medium]] to travel through as it can pass through a [[vacuum]].
+
: [[Light]] can travel through a [[transparent]] [[medium]] but it does not need [[matter]] to travel through as it can pass through a [[vacuum]].
 
: [[Light]] can travel through any [[transparent]] [[solid]], [[liquid]], [[gas]].
 
: [[Light]] can travel through any [[transparent]] [[solid]], [[liquid]], [[gas]].
 
: [[Light]] travels most quickly through a [[vacuum]].
 
: [[Light]] travels most quickly through a [[vacuum]].
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===Colour===
 
===Colour===
−
Light can be divided into 7 [[colour]]s:
+
[[Light]] can be divided into 7 [[colour]]s:
 
*Red
 
*Red
 
*Orange
 
*Orange
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*Indigo
 
*Indigo
 
*Violet
 
*Violet
 +
 +
==Key Stage 4==
 +
===Meaning===
 +
'''Visible light''' is an [[Electromagnetic Wave|electromagnetic wave]] that [[human]]s can see.
 +
 +
===About Light===
 +
====Properties====
 +
: '''Visible light''' is a [[Transverse Wave|transverse wave]].
 +
: '''Visible light''' can travel through a [[vacuum]] as well as through any [[transparent]] [[solid]], [[liquid]], [[gas]].
 +
: The [[speed]] of '''visible light''' through a [[vacuum]] is 300,000,000[[m/s]].
 +
As a [[wave]] [[light]] can be:
 +
*[[Transmit|Transmitted]] - '''Visible light''' can pass through a [[medium]].
 +
*[[Absorb (physics)|Absorbed]] - The [[energy]] [[Energy Transfer|transferred]] by '''visible light''' can be taken in by an [[opaque]] [[material]].
 +
*[[Reflection|Reflected]] - '''Visible light''' can bounce off the [[interface]] between two [[medium|media]]. This can be either [[Diffuse Reflection]] or [[Specular Reflection]].
 +
*[[Refraction|Refracted]] - '''Visible light''' can change direction when it crosses the [[interface]] between two  [[medium|media]].
 +
=====Colour=====
 +
: Different [[frequency|frequencies]] of '''visible light''' are [[reflect]]ed or [[Absorb (Physics)|absorbed]] by different surfaces giving them colour.
 +
'''Visible light''' can be divided into 7 [[colour]]s:
 +
*Red - The lowest [[frequency]] and longest [[wavelength]] of '''visible light'''.
 +
*Orange
 +
*Yellow
 +
*Green
 +
*Blue
 +
*Indigo
 +
*Violet - The highest [[frequency]] and shortest [[wavelength]] of '''visible light'''.
 +
 +
====Applications====
 +
: '''Visible light''' is used for [[sight]], photography, microscopy, telescopy because it can be seen with the [[human]] [[eye]].
 +
: '''Visible light''' can be used in [[Fibre Optics|fibre optic]] communication because it is not [[Absorb (Physics)|absorbed]] by the [[glass]] that the fibres are made from and it is [[reflection|reflected]] internally by the [[interface]] between the [[glass]] and the [[air]].
 +
====Dangers====
 +
: There are no dangers of '''visible light''', unless it is extremely intense in which case it could cause blindness.
 +
===References===
 +
====AQA====
 +
 +
:[https://www.amazon.co.uk/gp/product/0008158770/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158770&linkCode=as2&tag=nrjc-21&linkId=ec31595e720e1529e49876c3866fff6e ''Light year, page 274, GCSE Physics; Student Book, Collins, AQA '']
 +
:[https://www.amazon.co.uk/gp/product/1471851354/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851354&linkCode=as2&tag=nrjc-21&linkId=9012a0d354024419214fb3ad5ac44ba0 ''Light, models of, page 336, GCSE Combined Science Trilogy 1, Hodder, AQA '']
 +
:[https://www.amazon.co.uk/gp/product/0198359373/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359373&linkCode=as2&tag=nrjc-21&linkId=952a73bbb09d222ecc4b50d200679849 ''Light, pages 124, 126-127, 131, 154-157, 176-177, GCSE Biology; Third Edition, Oxford University Press, AQA '']
 +
:[https://www.amazon.co.uk/gp/product/019835939X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=019835939X&linkCode=as2&tag=nrjc-21&linkId=57e96876985fc39b1a3d8a3e3dc238b6 ''Light, pages 192, 202-213, 238-239, GCSE Physics; Third Edition, Oxford University Press, AQA '']
 +
:[https://www.amazon.co.uk/gp/product/1471851370/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851370&linkCode=as2&tag=nrjc-21&linkId=01c69b0ae058f809cf636033e6ba793e ''Light; red-shift, page 256, GCSE Physics, Hodder, AQA '']
 +
:[https://www.amazon.co.uk/gp/product/1471851370/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851370&linkCode=as2&tag=nrjc-21&linkId=01c69b0ae058f809cf636033e6ba793e ''Light; reflection of, pages 188-90, 195, 197, GCSE Physics, Hodder, AQA '']
 +
:[https://www.amazon.co.uk/gp/product/1471851370/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851370&linkCode=as2&tag=nrjc-21&linkId=01c69b0ae058f809cf636033e6ba793e ''Light; refraction of, pages 195-6, 198, GCSE Physics, Hodder, AQA '']
 +
:[https://www.amazon.co.uk/gp/product/1471851370/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851370&linkCode=as2&tag=nrjc-21&linkId=01c69b0ae058f809cf636033e6ba793e ''Light; spectrum of, pages 207-8, GCSE Physics, Hodder, AQA '']
 +
:[https://www.amazon.co.uk/gp/product/1471851370/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851370&linkCode=as2&tag=nrjc-21&linkId=01c69b0ae058f809cf636033e6ba793e ''Light; transmission and absorption of, pages 189-90, GCSE Physics, Hodder, AQA '']
 +
:[https://www.amazon.co.uk/gp/product/1471851370/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851370&linkCode=as2&tag=nrjc-21&linkId=01c69b0ae058f809cf636033e6ba793e ''Light; uses and applications, page 200, GCSE Physics, Hodder, AQA '']
 +
:[https://www.amazon.co.uk/gp/product/0008158770/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158770&linkCode=as2&tag=nrjc-21&linkId=ec31595e720e1529e49876c3866fff6e ''Visible light, pages 190-1, 226-7, 234, GCSE Physics; Student Book, Collins, AQA '']
 +
:[https://www.amazon.co.uk/gp/product/019835939X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=019835939X&linkCode=as2&tag=nrjc-21&linkId=57e96876985fc39b1a3d8a3e3dc238b6 ''Visible light, pages 192, 206-207, GCSE Physics; Third Edition, Oxford University Press, AQA '']
 +
:[https://www.amazon.co.uk/gp/product/1782946403/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946403&linkCode=as2&tag=nrjc-21&linkId=32a0abb60dff015b15b50e9b1d7b4644 ''Visible light, pages 200, 207, GCSE Combined Science Trilogy; Physics, CGP, AQA '']
 +
:[https://www.amazon.co.uk/gp/product/1782945598/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945598&linkCode=as2&tag=nrjc-21&linkId=ad276ad49df77ab4b40ab4fd0fe10405 ''Visible light, pages 223, 225, GCSE Combined Science; The Revision Guide, CGP, AQA '']
 +
:[https://www.amazon.co.uk/gp/product/1782945970/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945970&linkCode=as2&tag=nrjc-21&linkId=a120d24dcc7cc7a58192069a3aafc1d2 ''Visible light, pages 242, 249, 253, 254, 261, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA '']
 +
:[https://www.amazon.co.uk/gp/product/178294558X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=178294558X&linkCode=as2&tag=nrjc-21&linkId=f0dfb66dafcb0c6e9449e7b1a4ae1ac486 ''Visible light, pages 76, 85, GCSE Physics; The Revision Guide, CGP, AQA '']
 +
:[https://www.amazon.co.uk/gp/product/1782945970/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945970&linkCode=as2&tag=nrjc-21&linkId=a120d24dcc7cc7a58192069a3aafc1d2 ''Visible light; lenses, pages 266-276, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA '']
 +
:[https://www.amazon.co.uk/gp/product/1782946403/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946403&linkCode=as2&tag=nrjc-21&linkId=32a0abb60dff015b15b50e9b1d7b4644 ''Visible light; reflection and refraction, pages 195-197, GCSE Combined Science Trilogy; Physics, CGP, AQA '']
 +
:[https://www.amazon.co.uk/gp/product/1782945970/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945970&linkCode=as2&tag=nrjc-21&linkId=a120d24dcc7cc7a58192069a3aafc1d2 ''Visible light; reflection and refraction, pages 232-238, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA '']
 +
:[https://www.amazon.co.uk/gp/product/178294558X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=178294558X&linkCode=as2&tag=nrjc-21&linkId=f0dfb66dafcb0c6e9449e7b1a4ae1ac487 ''Visible light; refraction and reflection, pages 77, 80, GCSE Physics; The Revision Guide, CGP, AQA '']
 +
 +
====Edexcel====
 +
 +
:[https://www.amazon.co.uk/gp/product/1292120223/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120223&linkCode=as2&tag=nrjc-21&linkId=068ecf40278c32406a7f1c6e66751417 ''Light, page 68, GCSE Physics, Pearson Edexcel '']
 +
:[https://www.amazon.co.uk/gp/product/1292120223/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120223&linkCode=as2&tag=nrjc-21&linkId=068ecf40278c32406a7f1c6e66751417 ''Light; angle of incidence, page 66, GCSE Physics, Pearson Edexcel '']
 +
:[https://www.amazon.co.uk/gp/product/1292120223/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120223&linkCode=as2&tag=nrjc-21&linkId=068ecf40278c32406a7f1c6e66751417 ''Light; angle of reflection, page 66, GCSE Physics, Pearson Edexcel '']
 +
:[https://www.amazon.co.uk/gp/product/1292120223/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120223&linkCode=as2&tag=nrjc-21&linkId=068ecf40278c32406a7f1c6e66751417 ''Light; filters, page 69, GCSE Physics, Pearson Edexcel '']
 +
:[https://www.amazon.co.uk/gp/product/1292120223/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120223&linkCode=as2&tag=nrjc-21&linkId=068ecf40278c32406a7f1c6e66751417 ''Light; ray diagrams, pages 66-67, GCSE Physics, Pearson Edexcel '']
 +
:[https://www.amazon.co.uk/gp/product/1292120223/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120223&linkCode=as2&tag=nrjc-21&linkId=068ecf40278c32406a7f1c6e66751417 ''Light; red shift, pages 124-125, GCSE Physics, Pearson Edexcel '']
 +
:[https://www.amazon.co.uk/gp/product/1292120223/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120223&linkCode=as2&tag=nrjc-21&linkId=068ecf40278c32406a7f1c6e66751417 ''Light; reflection, page 66, GCSE Physics, Pearson Edexcel '']
 +
:[https://www.amazon.co.uk/gp/product/1292120223/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120223&linkCode=as2&tag=nrjc-21&linkId=068ecf40278c32406a7f1c6e66751417 ''Light; refraction, page 66, GCSE Physics, Pearson Edexcel '']
 +
:[https://www.amazon.co.uk/gp/product/1292120223/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120223&linkCode=as2&tag=nrjc-21&linkId=068ecf40278c32406a7f1c6e66751417 ''Light; transmission, page 69, GCSE Physics, Pearson Edexcel '']
 +
:[https://www.amazon.co.uk/gp/product/1292120223/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120223&linkCode=as2&tag=nrjc-21&linkId=068ecf40278c32406a7f1c6e66751417 ''Light; visible spectrum, page 68, GCSE Physics, Pearson Edexcel '']
 +
:[https://www.amazon.co.uk/gp/product/1292120223/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120223&linkCode=as2&tag=nrjc-21&linkId=068ecf40278c32406a7f1c6e66751417 ''Light; white light, page 68, GCSE Physics, Pearson Edexcel '']
 +
:[https://www.amazon.co.uk/gp/product/1782948163/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782948163&linkCode=as2&tag=nrjc-21&linkId=0fdbfd5dd397d6e24a9dfb250f08587f ''Visible light, pages 127, 137, GCSE Physics, CGP, Edexcel '']
 +
:[https://www.amazon.co.uk/gp/product/1782945741/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945741&linkCode=as2&tag=nrjc-21&linkId=30da4f2178da182547b62a7329d13b57 ''Visible light, pages 168, 171, GCSE Combined Science; The Revision Guide, CGP, Edexcel '']
 +
:[https://www.amazon.co.uk/gp/product/1782945733/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945733&linkCode=as2&tag=nrjc-21&linkId=2a2dbec9db6bf5766c0458d908fa0a52 ''Visible light, pages 40, 43, 47, GCSE Physics; The Revision Guide, CGP, Edexcel '']
 +
:[https://www.amazon.co.uk/gp/product/1292120223/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120223&linkCode=as2&tag=nrjc-21&linkId=068ecf40278c32406a7f1c6e66751417 ''Visible light, pages 72, 78, 95, GCSE Physics, Pearson Edexcel '']
 +
:[https://www.amazon.co.uk/gp/product/1782948163/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782948163&linkCode=as2&tag=nrjc-21&linkId=0fdbfd5dd397d6e24a9dfb250f08587f ''Visible light; colour, pages 137-139, GCSE Physics, CGP, Edexcel '']
 +
:[https://www.amazon.co.uk/gp/product/1782948163/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782948163&linkCode=as2&tag=nrjc-21&linkId=0fdbfd5dd397d6e24a9dfb250f08587f ''Visible light; uses, page 134, GCSE Physics, CGP, Edexcel '']
 +
 +
====OCR====
 +
:[https://www.amazon.co.uk/gp/product/1782945695/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945695&linkCode=as2&tag=nrjc-21&linkId=ceafcc80bcad6b6754ee97a0c7ceea53 ''Light, pages 189-192, 194, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR '']
 +
:[https://www.amazon.co.uk/gp/product/1782945687/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945687&linkCode=as2&tag=nrjc-21&linkId=9a598e52189317a20311d7a632747bc9 ''Light, pages 61-63, 66, 68, 70-72, Gateway GCSE Physics; The Revision Guide, CGP, OCR  '']
 +
:[https://www.amazon.co.uk/gp/product/0198359810/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359810&linkCode=as2&tag=nrjc-21&linkId=d768d99f1a06f7c12fab40e5aef85a55 ''Light, plant responses to, pages 49, 51-53, 83, 110-111, Gateway GCSE Biology, Oxford, OCR '']
 +
:[https://www.amazon.co.uk/gp/product/1782945695/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945695&linkCode=as2&tag=nrjc-21&linkId=ceafcc80bcad6b6754ee97a0c7ceea53 ''Light; reflection page 189, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR '']
 +
:[https://www.amazon.co.uk/gp/product/1782945687/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945687&linkCode=as2&tag=nrjc-21&linkId=9a598e52189317a20311d7a632747bc9 ''Light; reflection, pages 61, 62, Gateway GCSE Physics; The Revision Guide, CGP, OCR  '']
 +
:[https://www.amazon.co.uk/gp/product/1782945695/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945695&linkCode=as2&tag=nrjc-21&linkId=ceafcc80bcad6b6754ee97a0c7ceea53 ''Light; refraction, pages 190, 191, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR '']
 +
:[https://www.amazon.co.uk/gp/product/1782945687/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945687&linkCode=as2&tag=nrjc-21&linkId=9a598e52189317a20311d7a632747bc9 ''Light; refraction, pages 61, 63, Gateway GCSE Physics; The Revision Guide, CGP, OCR  '']
 +
:[https://www.amazon.co.uk/gp/product/0198359837/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359837&linkCode=as2&tag=nrjc-21&linkId=3c4229e8b023b2b60768e7ea2307cc6f ''Visible light, pages 152, 164-165, 264-265, Gateway GCSE Physics, Oxford, OCR '']
 +
:[https://www.amazon.co.uk/gp/product/1782945695/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945695&linkCode=as2&tag=nrjc-21&linkId=ceafcc80bcad6b6754ee97a0c7ceea53 ''Visible light, pages 192, 194, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR '']
 +
 +
==Beyond the Curriculum==
 +
{{#ev:youtube|https://www.youtube.com/watch?v=IXxZRZxafEQ}}

Latest revision as of 13:53, 23 August 2022

Key Stage 2

Meaning

Light is what we can see with our eyes and dark is when there is not enough light to see things clearly.

About Light and Dark

Light can be very bright or it can be very dark.
Light travels in straight lines.
Light comes from luminous objects and is reflected off non-luminous objects. The Sun can be seen because it is luminous. The Moon can be seen because it reflects the light of The Sun.
When light is very bright it can hurt our eyes. Light from The Sun is very bright and we shouldn't look at The Sun because it can cause people to go blind.
When there is not enough light to see we say it is dark. At night time it is very dark which is why it is hard to see.
LightDarkRoom.png
LightManBoyBulb.png
No-one can see because there is no light so the room is dark. The man can see the light bulb because light from the bulb goes into the man's eyes. The boy cannot see the light bulb because his eyes are closed.

Key Stage 3

Meaning

Light is a wave that humans can see with their eyes.

About Light

Light is a transverse wave.
Light can travel through a vacuum as well as through any transparent solid, liquid, gas.
The speed of light through a vacuum is 300,000,000m/s.

As a wave light can be:

Medium

Light can travel through a transparent medium but it does not need matter to travel through as it can pass through a vacuum.
Light can travel through any transparent solid, liquid, gas.
Light travels most quickly through a vacuum.
Light travels most slowly through solids.

Colour

Light can be divided into 7 colours:

  • Red
  • Orange
  • Yellow
  • Green
  • Blue
  • Indigo
  • Violet

Key Stage 4

Meaning

Visible light is an electromagnetic wave that humans can see.

About Light

Properties

Visible light is a transverse wave.
Visible light can travel through a vacuum as well as through any transparent solid, liquid, gas.
The speed of visible light through a vacuum is 300,000,000m/s.

As a wave light can be:

Colour
Different frequencies of visible light are reflected or absorbed by different surfaces giving them colour.

Visible light can be divided into 7 colours:

Applications

Visible light is used for sight, photography, microscopy, telescopy because it can be seen with the human eye.
Visible light can be used in fibre optic communication because it is not absorbed by the glass that the fibres are made from and it is reflected internally by the interface between the glass and the air.

Dangers

There are no dangers of visible light, unless it is extremely intense in which case it could cause blindness.

References

AQA

Light year, page 274, GCSE Physics; Student Book, Collins, AQA
Light, models of, page 336, GCSE Combined Science Trilogy 1, Hodder, AQA
Light, pages 124, 126-127, 131, 154-157, 176-177, GCSE Biology; Third Edition, Oxford University Press, AQA
Light, pages 192, 202-213, 238-239, GCSE Physics; Third Edition, Oxford University Press, AQA
Light; red-shift, page 256, GCSE Physics, Hodder, AQA
Light; reflection of, pages 188-90, 195, 197, GCSE Physics, Hodder, AQA
Light; refraction of, pages 195-6, 198, GCSE Physics, Hodder, AQA
Light; spectrum of, pages 207-8, GCSE Physics, Hodder, AQA
Light; transmission and absorption of, pages 189-90, GCSE Physics, Hodder, AQA
Light; uses and applications, page 200, GCSE Physics, Hodder, AQA
Visible light, pages 190-1, 226-7, 234, GCSE Physics; Student Book, Collins, AQA
Visible light, pages 192, 206-207, GCSE Physics; Third Edition, Oxford University Press, AQA
Visible light, pages 200, 207, GCSE Combined Science Trilogy; Physics, CGP, AQA
Visible light, pages 223, 225, GCSE Combined Science; The Revision Guide, CGP, AQA
Visible light, pages 242, 249, 253, 254, 261, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA
Visible light, pages 76, 85, GCSE Physics; The Revision Guide, CGP, AQA
Visible light; lenses, pages 266-276, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA
Visible light; reflection and refraction, pages 195-197, GCSE Combined Science Trilogy; Physics, CGP, AQA
Visible light; reflection and refraction, pages 232-238, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA
Visible light; refraction and reflection, pages 77, 80, GCSE Physics; The Revision Guide, CGP, AQA

Edexcel

Light, page 68, GCSE Physics, Pearson Edexcel
Light; angle of incidence, page 66, GCSE Physics, Pearson Edexcel
Light; angle of reflection, page 66, GCSE Physics, Pearson Edexcel
Light; filters, page 69, GCSE Physics, Pearson Edexcel
Light; ray diagrams, pages 66-67, GCSE Physics, Pearson Edexcel
Light; red shift, pages 124-125, GCSE Physics, Pearson Edexcel
Light; reflection, page 66, GCSE Physics, Pearson Edexcel
Light; refraction, page 66, GCSE Physics, Pearson Edexcel
Light; transmission, page 69, GCSE Physics, Pearson Edexcel
Light; visible spectrum, page 68, GCSE Physics, Pearson Edexcel
Light; white light, page 68, GCSE Physics, Pearson Edexcel
Visible light, pages 127, 137, GCSE Physics, CGP, Edexcel
Visible light, pages 168, 171, GCSE Combined Science; The Revision Guide, CGP, Edexcel
Visible light, pages 40, 43, 47, GCSE Physics; The Revision Guide, CGP, Edexcel
Visible light, pages 72, 78, 95, GCSE Physics, Pearson Edexcel
Visible light; colour, pages 137-139, GCSE Physics, CGP, Edexcel
Visible light; uses, page 134, GCSE Physics, CGP, Edexcel

OCR

Light, pages 189-192, 194, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR
Light, pages 61-63, 66, 68, 70-72, Gateway GCSE Physics; The Revision Guide, CGP, OCR
Light, plant responses to, pages 49, 51-53, 83, 110-111, Gateway GCSE Biology, Oxford, OCR
Light; reflection page 189, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR
Light; reflection, pages 61, 62, Gateway GCSE Physics; The Revision Guide, CGP, OCR
Light; refraction, pages 190, 191, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR
Light; refraction, pages 61, 63, Gateway GCSE Physics; The Revision Guide, CGP, OCR
Visible light, pages 152, 164-165, 264-265, Gateway GCSE Physics, Oxford, OCR
Visible light, pages 192, 194, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR

Beyond the Curriculum

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