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Question
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 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 :
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Solution
The correct option is A 3d
By similar triangles, ΔAEC≈ΔIHA
y2L=d2L
y=d
Total distance, CD = y+d2+d2+y=3d
By similar triangles, ΔAEC≈ΔIHA
y2L=d2L
y=d
Total distance, CD = y+d2+d2+y=3d
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