What is it called when light changes direction after leaving a lens?
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This change of direction is called refraction. When light enters a more dense substance (higher refractive index), it 'bends' more towards the normal line. The amount of bending depends on two things: Change in speed – if a substance causes the light to speed up or slow down more, it will refract (bend) more.
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When a ray passes from air into glass the direction in which the light ray is travelling changes. ... This 'bending of a ray of light' when it passes from one substance into another substance is called refraction.
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