Question

Why does a light ray passes through the optical center of a lens without refraction?

Answer 1

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The middle portion of any lens is relatively flat. Pole is a point in the principal axis, within the lens, through which un-deviated rays pass.

Answer 2

Answer:

The center of a lens is comparatively flat that the other points of the lens. This can be found in thin lens rather than thick lenses. Because, it doesn't mean that there is no refraction when we mean there is no deviation in the ray that is passed through.

Explanation:

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