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Q.

The radius of curvature of a spherical mirror is 20cm. What is its focal length ?


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a

10 cm

b

20 cm

c

30 cm

d

40 cm 

answer is A.

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Detailed Solution

Concept: A spherical mirror's radius of curvature is essentially the radius or the distance from the centre to the periphery of the circle to which it belongs. Its focal length is double that.
Radius of Spherical mirror = 20 cm
Formula for Radius of curvature of a spherical mirror = 2 × focal length (f)
By substituting the value we get
20= 2× f
f= 202
f= 10 cm
Hence, the correct answer is option 1.
 
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