Question

An object is kept in front of a concave mirror of focal length 20 cm. The image is three times the size of the object.Calculate two possible distance of the object from the mirror.

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Solution
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It is given that,

Focal length

The image is three times the size of the object. So there are two cases.

Case 1. For real image

Using mirror’s formula

Case 2. For virtual image

Again using mirror’s formula

The possible values of u are .

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