Question

22. A point object is placed in front of a plane mirror at a distance of 3m from it. It is desired to photo
graph the image of the object by placing a camera at a distance of 4 m from the mirror. Find the
distance (in m) at which the camera lens should be focused.​

Answer 1

Answer:

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Explanation:

The distance between the object and the mirror is 3m, i.e., d

1

=3m,

Hence image distance also equals d

1

=3m

Also, the distance between the mirror and the camera is 4.5m, i.e., d

2

=4.5m .

Hence the focus of the camera,

f=d

1

+d

2

=3+4.5=7.5m