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: 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.
{| class="wikitable"
|-
|[[File:LightDarkRoom.png|center|400px]]
|[[File:LightManBoyBulb.png|center|400px]]
|-
| style="height:20px; width:400px; text-align:center;" |No-one can see because there is no '''light''' so the room is '''dark'''.
| style="height:20px; width:400px; text-align:center;" |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.
|}