What is refraction?

Refraction is the change in direction of light as it passes from one transparent medium to another, such as from air to glass or water.

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What happens to light when it moves from air to glass?

When light moves from air (a less dense medium) to glass (a more dense medium), it bends towards the normal line.

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What happens to light when it moves from glass to air?

When light moves from glass (a more dense medium) to air (a less dense medium), it bends away from the normal line.

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