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Mirror Formula and Magnification

An object is ...

Question

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 is : (a) less than 100 mm (b) between 100 mm and 200 mm (c) exactly 200 mm (d) more than 200 mm

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Solution

Answer: (d) more than 200 mm

Explanation:

Since the image formed is upright, the object lies within the focus of the concave mirror.
So, f > 100mm
We know R =2f
So,R > 200 mm
Hence, radius of curvature is greater than 200 mm.

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