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A point source of light S, placed at a distance I, 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 2I, from it as shown. The greatest distance over which he can see the image of the light source in the mirror is
A. |
`d/2` |
B. |
d |
C. |
2d |
D. |
3d |
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