Refraction happens when light crosses a boundary between two materials. air glass Slide 1 of 14

When light goes from air to glass it slows down and changes direction towards the normal. Slide 2 of 14

The angle of refraction is smaller than the angle of incidence. air glass angle of incidence angle of refraction Slide 3 of 14

When the light leaves the glass it speeds up again When the light leaves the glass it speeds up again. It changes direction away from the normal. air glass Slide 4 of 14

The angle of refraction is bigger than the angle of incidence. air glass angle of incidence angle of refraction Slide 5 of 14

The light ray that emerges from the glass block is parallel to the original incident ray. air glass Slide 6 of 14

What will happen to this ray of light? air glass Slide 7 of 14

The light changes direction towards the normal as it goes into the glass. air glass Slide 8 of 14

It changes direction away from the normal as it leaves the glass. air glass Slide 9 of 14

What will happen to this ray of light? air water Slide 10 of 14

Light speeds up when it goes from water to air, so the light ray will change direction away from the normal. air water Slide 11 of 14

What will happen to this ray? air water Slide 12 of 14

It will change direction away from the normal It will change direction away from the normal. The angle of incidence is smaller than for the first ray, so the angle of refraction is also smaller. air water Slide 13 of 14

The two rays appear to be coming from a point above the real object The two rays appear to be coming from a point above the real object. Water always looks shallower than it really is. air water Slide 14 of 14