A spherical mirror has radius of curvature equal to $50 c m$ . Find the value of focal length.

50 c m

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30 c m

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25 c m

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100 c m

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Solution

The correct option is C $25 c m$
We know,
$F o c a l l e n g t h (f) = \frac{R a d i u s o f c u r v a t u r e (R)}{2}$

Given,
Radius of curvature, $R = 50 c m$
$\Rightarrow f = \frac{R}{2} = \frac{50}{2} = 25 c m$
$\Rightarrow F o c a l l e n g t h (f) = 25 c m$

Hence, the correct answer is OPTION C.

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A spherical mirror has radius of curvature equal to 50cm. Find the value of focal length.

The correct option is C 25cmWe know,Focal length (f)=Radius of curvature (R)2Given, Radius of curvature, R=50 cm⇒f=R2=502=25 cm⇒Focal length (f)=25 cmHence, the correct answer is OPTION C.

A spherical mirror has radius of curvature equal to $50 c m$ . Find the value of focal length.