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f-R Relationship

A concave mir...

Question

A concave mirror of focal length f, in vacuum, is placed in a medium of refractive index 2. Its focal length in the medium is :

A

\frac{f}{2}

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B

f

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C

2 f

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D

4 f

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Solution

The correct option is B $f$
The focal length of a mirror is function of its radius of curvature and is independent of the medium as it is based on the laws of reflection. So the focal length f, remains same in every medium.

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