question_answer

It is desired to photograph the image of an object placed at a distance of \[3m\] from the plane mirror. The camera which is at a distance of \[4.5m\] from the mirror should be focussed for a distance of                                    [NCERT 1971]

A)            \[3m\]                                    

B)            \[4.5m\]

C)            \[6m\]                                    

D)            \[7.5m\]

Correct Answer: D

Solution :

                   Fo using distance of image = 4.5 m + 3 m = 7.5 m.