Physics-
General
Easy

Question

A beam of light AO is incident on a glass slab left parenthesis mu equals 1.54 right parenthesis in a direction as shown in figure. The reflected ray OB is passed through a Nicol prism on viewing through a Nicole prism, we find on rotating the prism that

  1. The intensity is reduced down to zero and remains zero    
  2. The intensity reduces down some what and rises again    
  3. There is no change in intensity    
  4. The intensity gradually reduces to zero and then again increases    

The correct answer is: The intensity gradually reduces to zero and then again increases

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