Q.

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 focused from your  eye will be 10×pcm  , what is value of p?

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answer is 4.

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Detailed Solution

The distance of image from the mirror will be 10 cm. The distance of the image from the observer = 10 + 30 = 40 cm.

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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 focused from your  eye will be 10× p cm  , what is value of p?