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Question

A point object is placed at a distance of 10cm and its real image is formed at a distance of 20cm from a concave mirror. If the object is moved by 0.1cm towards the mirror, the image will shift by about

A
0.4cm away from the mirror
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B
0.4cm towards the mirror
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C
0.8cm away from the mirror
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D
0.8cm towards the mirror
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Solution

The correct option is A 0.4cm away from the mirror

Mirror formula
1f=1v+1u1f=120+1(10)f=203 cm.
If object moves towards the mirror by 0.1cm then.

u=10-0.1=9.9 cm. Hence again from mirror formula 1203=1v+19.9 v'=20.4cm

i.e. images shift away from the mirror by 0.4 cm.


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