A point source of light S is placed at a distance L in front of the centre of plane mirror of width d which is hanging vertically on a wall. A man walks in front of the mirror along a line parallel to the mirror,, at a distance 2L as shown below. The distance over which the man can see the image of the light source in the mirror is :
A
d
B
3d
C
D
2d
Text Solution
Verified by ExpertsThe correct answer is:
B
By similar triangles
Δ AEC ~ ΔΙ HA
y = d
Total distance (CD) = 
= 3d
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