Question

Why can't flat lenses focus light?​

Answer 1

Flat lenses can focus a light when they are built properly.

As long as the front surface is parallel to the back surface, the angle of the exit ray matches the angle of the entering ray. If the rays are parallel to start with, they are parallel after traveling through the window. To focus light, you need to bring parallel rays to a single point.

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Answer 2

Flat lenses can focus a light when they are built properly.

As long as the front surface is parallel to the back surface, the angle of the exit ray matches the angle of the entering ray. If the rays are parallel to start with, they are parallel after traveling through the window. To focus light, you need to bring parallel rays to a single point.

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