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Question

A point on the principle axis of a lens through which light passes undeviated is called__________.


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Solution

Optical center:

It is a point lying on the principal axis of the lens so that a ray of light whose refracted path passes through this point will have its emergent path parallel to the direction of the incident ray.

Hence, a point on the principal axis of a lens through which light passes undeviated is called an optical center.


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