Physics-
General
Easy

Question

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 as shown. The greatest distance over which he can see the image of the light source in the mirror is

  1. d/2    
  2. d    
  3. 2d    
  4. 3d    

The correct answer is: 3d


    According to the following ray diagram H I equals A B equals d
    and D S equals C D equals fraction numerator d over denominator 2 end fraction

    because A H equals 2 A D rightwards double arrow G H equals 2 C D equals fraction numerator 2 d over denominator 2 end fraction equals d
    SimilarlyI J equals dso G J equals G H plus H I plus I J equals d plus d plus d equals 3 d

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