Optics 1 Question 8

8. A point source of light S, placed at a distance L in front of the centre of a plane mirror of width d, hangs 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 as shown. The greatest distance over which he can see the image of the light source in the mirror is

(2000,2M)

(a) d/2

(b) d

(c) 2d

(d) 3d

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Answer:

Correct Answer: 8. (d)

Solution:

  1. The ray diagram will be as follows :

Since, AH=2AD

GH=2CD=2d2=d

Similarly,

IJ=dGJ=GH+HI+IJ=d+d+d=3d

GJ=GH+HI+IJ



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