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Question

The focal length and radius of curvature are related by the formula


A

f=2r

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B

f=1r

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C

r=2f

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D

r=f2

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Solution

The correct option is C

r=2f


  1. Focal length: The distance between the pole (P) and focus (F) is called the focal length (f).
  2. It is denoted by f.
  3. If f is the focal length and r is the radius of curvature, then the relation is given by,

r=2f

or,

f=r2

Hence, option C is correct.


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