Question

Define
1. optical centre
2.principal focus .​

Answer 1

Answer:

o is optical centre

p is principal focus

Explanation:

refer to class 10 , ch. 10

Answer 2

) Optical center is defined as the point on the lens which is on the principal axis and the light ray doesn't deflect when passes through it. (ii) Centre of curvature is defined as the center of the surface of sphere of which the lens is a part.

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