Question

Why does a ray of light passes straight from optical centre of a lens ?

Answer 1

Explanation:

The ray passing through optical center does no deviate because the curvature of the Lens at the incident and exit point are exactly opposite so the deviation at the first point is cancelled at the other point.

Answer 2

Answer:

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Look at the lens as a slab of finite thickness. ... Therefore it will emerge on the other side of the lens on a direction slightly displaced, but parallel to the incident one. Since the parallel displacement is tiny as long as the lens is not too thick, it looks like the ray passes through the center undeviated.