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Two polaroids have their polarizing directions parallel so that the intensity of a transmitted light is maximum. The angle through which either polaroid must be turned if the intensity is to drop by one-half is

Options

  1. A135^
  2. B90^
  3. C120^
  4. D180^

Correct answer

A. 135^

Step-by-step solution

For I= I₀ 2 and I=I₀ ^2 = I₀ 2 =45^ Therefore the angle through which either polaroids turned is 135^ (=180^ -45^ )

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