Focal length of a spherical mirror is $200 c m$ . What will be its radius of curvature?

100 c m

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25 c m

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50 c m

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400 c m

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Solution

The correct option is D $400 c m$
We know,
$F o c a l l e n g t h (f) = \frac{R a d i u s o f c u r v a t u r e (R)}{2}$

$\Rightarrow R a d i u s o f c u r v a t u r e (R) = 2 \times F o c a l l e n g t h (f)$

Given,
Focal Length, $f = 200 c m$
$\Rightarrow R = 2 \times f = 2 \times 200 = 400 c m$
$\Rightarrow R a d i u s o f c u r v a t u r e (R) = 400 c m$

Hence, the correct answer is OPTION D.

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Focal length of a spherical mirror is 200cm. What will be its radius of curvature?

The correct option is D 400cmWe know,Focal length (f)=Radius of curvature (R)2⇒Radius of curvature (R)=2×Focal length (f)Given, Focal Length, f=200 cm⇒R=2×f=2×200=400 cm⇒Radius of curvature (R)=400 cmHence, the correct answer is OPTION D.

Focal length of a spherical mirror is $200 c m$ . What will be its radius of curvature?