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f-R Relationship

A concave mir...

Question

A concave mirror is made by cutting a portion of a hollow glass sphere of radius $24$ cm. Find the focal length of the mirror.

A

24 cm

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B

12 cm

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C

6 cm

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D

18 cm

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Solution

The correct option is B 12 cm
The radius of curvature of the mirror $= 24 c m .$
Thus the focal length
$= 24 c m / 2$
$= 12 c m .$

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