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 focussed for a distance of

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4.5m

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7.5m

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Solution

The correct option is D. 7.5m.
The distance between the object and the mirror is 3m, i.e., $d_{1} = 3 m$ ,
Hence image distance also equals $d_{1} = 3 m$
Also, the distance between the mirror and the camera is 4.5m, i.e., $d_{2} = 4.5 m$ .
Hence the focus of the camera,
$F = d_{1} + d_{2} = 3 + 4.5 = 7.5 m$ .

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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 focussed for a distance of

The correct option is D. 7.5m.The distance between the object and the mirror is 3m, i.e., d1=3m,Hence image distance also equals d1=3mAlso, the distance between the mirror and the camera is 4.5m, i.e., d2=4.5m.Hence the focus of the camera,F=d1+d2=3+4.5=7.5m.