Refraction
When light rays reach an angulated surface of a different material, it causes the light rays to bend. This is called refraction. When light reaches a convex lens, the light rays bend toward the center:
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When light rays reach a concave lens, the light rays bend away from the center:
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The eye has multiple angulated surfaces that cause light to bend. These are:
- The interface between the air and the front of the cornea
- The interface between the back of the cornea and the aqueous humor
- The interface between the aqueous humor and the front of the lens
- The interface between the back of the lens and the vitreous humor
