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Q.

An object 1 cm tall is placed 4 cm in front of a mirror. In order to produce an upright image of 3 cm height one needs a

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a

Concave mirror of radius of curvature 12 cm

b

Convex mirror of radius of curvature 12cm

c

Concave mirror of radius of curvature 4 cm

d

Plane mirror of height 12 cm

answer is B.

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Detailed Solution

Magnification is 3. So,v/u= –3 so, v = 12cm .

112+14=1f.

We obtain f = – 6cm. Hence it’s a concave mirror of radius of curvature 12cm.

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An object 1 cm tall is placed 4 cm in front of a mirror. In order to produce an upright image of 3 cm height one needs a