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Questions  

A spherical mirror forms an image of magnification 3. The object distance, if focal length of mirror is 24 cm, may be

a
32 cm, 24 cm
b
32 cm, 16 cm
c
32 cm only
d
16 cm only

detailed solution

Correct option is B

m=ff−u3=−24−24−u or    −24−u=−8 or u+24=8 or   u=(8−24)cm=−16cm  If m=−3, then −3=−24−24−uu+24=−8 or  u=−32cm Note that the magnification is greater than 1, so mirror cannot be convex.

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