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 2L from it. The distance over which he can see the image of the light source in the mirror is
Answer & explanation
Correct answer: option 4
In similar ΔABI & ΔMNI
MN/AB = IQ/IP
⇒ MN = (3L/L)(d) = 3d
Hence (D) is correct