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General
Easy

Question

A ray of light travels from a light source S to an observer after reflection from a plane mirror. If the source rotates in the clockwise direction by 10°, by what angle and in what direction the mirror should be rotated so that the light ray still strikes the deserver?

  1. 10° anticlockwise    
  2. 10° clockwise    
  3. 5° clockwise    
  4. 5° anti clockwise    

The correct answer is: 5° clockwise

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