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How does refraction affect light?

Answer 1

By bending it and so changing its direction.

Refraction normally occurs at the interface between two media with different refractive index, #n# (say, air and water). This index gives us the change in velocity (slowing down) of light in a spacific medium. Light travelling in air, for example, slows down entering at a certai angle into water and so changes direction:

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Answer 2

Asher Cohen

Refraction is the bending of light as it passes from one medium to another. This bending occurs because light travels at different speeds in different mediums. When light enters a medium where it travels more slowly, like from air into water, it bends towards the normal. If it enters a medium where it travels faster, like from water to air, it bends away from the normal.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.