Refraction and Lenses

What is refraction?

• When light bounces off a material's surface

• The spreading out of light into different colours when it passes through a prism

• The direction change of light when it travels from one material into another.

• When light is absorbed by an opaque object

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The '?' is referring to the...

• Inscident ray

• Refracted ray

• Independant ray

• Incident ray

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When light passes from air into glass it:

• Becomes faster

• Becomes slower

• Its speed does not change

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When light passes from air into glass (not travelling along the normal) it:

• Refracts away from the normal

• Refracts towards the normal

• Its direction does not change

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When light passes from water into air it:

• Becomes faster

• Becomes slower

• Its speed does not change

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When light passes from water into air (not travelling along the normal) it refracts:

• towards the normal

• away from the normal

• Its direction does not change

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Birds need to take REFRACTION into account when diving for fish in water because it makes the fish appear:

• Invisible

• Harder to see

• A different size

• In a different position to where they actually are

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After passing through a lens, light rays can either: (choose two)

• diverse

• diverge

• converse

• converge

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A lens that is curved outwards and is thicker in the middle is called a:

• concave lens

• convex lens

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Concave lenses cause light rays to:

• diverge

• converge