Lens
Contents
Key Stage 3
Meaning
A lens is a shaped piece of glass, or other transparent material, that can be used to focus an image of an object.
About Lenses
- A lens can be convex or concave.
- There is a lens in the eye that is used to focus an image onto the retina.
- Glass lenses can be moved relative to a screen until an image is focused but the lens in the eye can change shape to focus light.
Key Stage 4
Meaning
A lens is a shaped piece of glass, or other transparent material, that can be used to focus an image of an object.
About Lenses
- A lens can be convex, also called a converging lens or concave, also called a diverging lens.
- Lenses can be used to create a real image by focussing light onto a screen, or they can create a virtual image by looking through the lens.
- The shape of the lens determines its focal length. For a convex lens (converging lens) the focal length can be found by focussing the image of a "distant object" onto a screen. The distance between the screen and lens is the focal length.
- There is a lens in the eye that is used to focus an image onto the retina.
- Glass lenses can be moved relative to a screen until an image is focused but the lens in the eye can change shape to focus light.
References
AQA
- Lens; concave, pages 191, 228-9, GCSE Physics; Student Book, Collins, AQA
- Lens; convex, pages 191, 228-31, GCSE Physics; Student Book, Collins, AQA
- Lenses, concave, page 206, GCSE Physics, Hodder, AQA
- Lenses, pages 154-157, GCSE Biology; Third Edition, Oxford University Press, AQA
- Lenses, pages 195, 196, 198, GCSE Biology, CGP, AQA
- Lenses, pages 208-211, GCSE Physics; Third Edition, Oxford University Press, AQA
- Lenses, pages 70, 71, GCSE Biology; The Revision Guide, CGP, AQA
- Lenses, pages 82-84, GCSE Physics; The Revision Guide, CGP, AQA
- Lenses; comparison, pages 274, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA
- Lenses; concave, pages 267, 268, 273, 274, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA
- Lenses; concave, pages 82, 84, GCSE Physics; The Revision Guide, CGP, AQA
- Lenses; convex, pages 203-6, GCSE Physics, Hodder, AQA
- Lenses; convex, pages 266, 267, 270-272, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA
- Lenses; convex, pages 82-84, GCSE Physics; The Revision Guide, CGP, AQA
- Lenses; magnification, pages 275, 276, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA
- Lenses; ray diagrams, pages 270-273, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA
- Lenses; refraction of light, page 203, GCSE Physics, Hodder, AQA
- Lenses; replacement, page 199, GCSE Biology, CGP, AQA