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Question

Which of the following relations hold good where F is the focal length and R is the radius of curvature.


A

R = F

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B

R = F2

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C

F = R2

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D

F = 2R

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Solution

The correct option is C

F = R2


The focal point occurs at the midpoint between pole and radius of curvature. So, if
radius of curvature = R

F = R2


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