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Q.

An object is 100 mm in front of a concave mirror which produces an upright image (erect image). The radius of curvature of the mirror will be ?

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a

Less than 100 mm

b

Between 100 mm and 200 mm

c

Exactly 200 mm

d

More than 200 mm 

answer is D.

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Detailed Solution

An object is 100 mm in front of a concave mirror which produces an erect image. The radius of curvature will be more than 200 mm.
The reason is that a direct mirror creates a straight image where the object is placed between the focus and the pole. In addition, the bending radius doubles the distance between the focus and the pole.
As the image formed is upright, the object lies within the focus of the concave mirror.
Given,
f > 100 mm
We know R =2f
R>2×100 mm
So, R> 200 mm
  
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