Light Waves

1 mark · Easy

Light travels more slowly in glass than in air. What effect does this have on the speed and direction of a light ray passing from air into glass?

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The light ray slows down and bends towards the normal.

Also accept: It slows down and bends towards the normal; speed decreases and ray bends towards the normal

Common mistakes: It speeds up; It bends away from the normal

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Marking points

B1 · 1 mark · States both correct effects: slows down AND bends towards normal.

Worked solution

When light enters glass from air, it slows down and bends towards the normal.