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Q.

A convex mirror has a focal length 0.5 m. It’s radius of curvature is                   

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a

10 cm

b

100 cm

c

25 cm

d

2.5 cm

answer is B.

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Detailed Solution

Given that  f=0.5m⇒f=R2⇒0.5=R2⇒R=0.5×2=1m⇒R=100cm

 (for a convex mirror focal length is measured in the same direction of incident rays so using convention we consider f = + ve)

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