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Question
A convex mirror has a radius of curvature of 20 cm. An object is placed at such a distance from the mirror that the size of the image is exactly half that of the object. The object distance must be
A convex mirror has a radius of curvature of 20 cm. An object is placed at such a distance from the mirror that the size of the image is exactly half that of the object. The object distance must be
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Solution
The correct option is D 10 cm
Given that
R=20 cmf=R2=202=10 cm m=12
m=ff−u⇒12=1010−u
10−u=20
u=10−20=−10 cm
u=−10 cm
i e the object distance is 10 cm.
Given that
R=20 cmf=R2=202=10 cm m=12
m=ff−u⇒12=1010−u
10−u=20
u=10−20=−10 cm
u=−10 cm
i e the object distance is 10 cm.
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