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Question

A small object is placed 10 cm in front of a plane mirror. If you stand behind the object 30 cm from the mirror and look at its image, the distance between the observer and the image of the object will be

A
60 cm
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B
20 cm
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C
40 cm
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D
80 cm
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Solution

The correct option is C 40 cm

For plane mirror,
Object distance = image distance=10 cm
Distance between observer and mirror =30 cm
The distance to be focussed by observer in order to see the image is,
=30+10=40 cm
Hence, option (c) is the correct answer.

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