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Rules of Ray Diagram for Representation of Images Formed

An object is ...

Question

An object is 100mm in front of a concave mirror which produces an upright image. The radius of the curvature of the mirror is
A)less than 100mm
B)between 100mm and 200mm
C)exact 200mm
D)more than 200mm

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Solution

Since the image formed is upright, the object lies within the fopcus of the concave mirror
So, f > 100 mm
We know, R=2f
So, R > 200 mm
ie, Radius of curvature is more than 200 mm

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