Question

what is optical center of a lens? show by diagram how light ray is deflected by this point
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Answer 1

Answer:

The Optical center is the point lying on the principal axis of a lens through which light passes through without undergoing any deviation.

Answer 2

Answer:

A ray of light passing through the optical center suffers no refraction, that is, it passes undeviated. This is because, when it passes through the optical center, it is perpendicular to the curved surface of the lens. Hence, the angle of incidence is zero and therefore the angle of refraction is also zero.