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Spherical Lenses

What is the d...

Question

What is the distance $P B$ called?

A

Efficient length

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B

Radius of curvature

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C

Equivalent length

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D

Focal length.

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Solution

The correct option is C Focal length.
In case of concave mirror, the position of image and object will coincide if and only if the object is placed at center of curvature of lens.
If B is the center of PA, then PB will be equal to focal length.
Radius of curvature is twice the focal length.

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