Physics
Optics
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Question

If white light is used in the Newton’s rings experiment, the color observed in the reflected light is complementary to that observed in the transmitted light through the same point. This is due to

  1. 90 degree change of phase in one of the reflected waves    
  2. 180 degree change of phase in one of the reflected waves    
  3. 145 degree change of phase in one of the reflected waves    
  4. 45 degree change of phase in one of the reflected waves    

The correct answer is: 180 degree change of phase in one of the reflected waves


    The rings observed in reflected light are exactly complementary to those seen in transmitted light. Corresponding to every dark ring in reflected light there is a bright ring in transmitted light. The ray reflected at the upper surface of the air-film suffers no phase change while the ray reflected internally at the lower surface suffers a phase change of pi.

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