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  • A point source of light B is placed at a distance L in front of the centre of a mirror of width d hung vertically on a wall. A man walks in front of the mirror along a line parallel to the mirror a

A point source of light B is placed at a distance L in front of the centre of a mirror of width d hung vertically on a wall. A man walks in front of the mirror along a line parallel to the mirror at a distance 2 \mathrm{~L} from it. The distance over which he can see the image of the light source in the mirror is

Option: 1

\mathrm{d / 2}


Option: 2

\mathrm{d}


Option: 3

\mathrm{2d}


Option: 4

\mathrm{3d}


Answers (1)

best_answer


\mathrm{ In \: similar\: \triangle \mathrm{ABI}\, \& \, \Delta \mathrm{MNI}}

\mathrm{MN} / \mathrm{AB}=\mathrm{IQ} / \mathrm{IP}

\Rightarrow \mathrm{MN}=(3 \mathrm{~L} / \mathrm{L})(\mathrm{d})=3 \mathrm{~d}

Hence (D) is correct

Posted by

Ajit Kumar Dubey

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