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Question

In lens, all distances are measured from


A

focus

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B

pole

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C

optical centre

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D

radius of curvature

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Solution

The correct option is C

optical centre


  1. The centre point of the lens through which a ray of light passes without any deflection is known as the optical centre of the lens.
  2. In a lens, all the distances are measured from this optical centre.

Hence, option (c) is correct.


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