question_answer

It is desired to photograph the image of an object placed at a distance of 3 m from the plane mirror. The camera which is at a distance of 4.5 m from the mirror should be focused for a distance of

A)  3 m                                       

B)  4.5 m

C)  6 m                                       

D)  7.5 m

Correct Answer: D

Solution :

Image of the object is formed at a distance 3m from the inside of the mirror. \[\therefore \] Camera should be focused at distance                 \[=4.5+3\]                 \[=7.5m\]