A point source of light \( B \) is placed at a distance \( L \) in front of the centre of a mirr....

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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
\( \mathrm{P} \)
line parallel to the mirror at a distance \( 2 L \) from it as shown. The greatest distance over which he can see the image of the light source in the mirror is
(1) \( d / 2 \)
(2) \( d \)
(3) \( 2 d \)
(4) \( 3 d \)


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