Question

Problem 9 A linearly polarized electromagnetic wave is sent through two sheets of polarizing material. The first sheet, A, is oriented so that its transmission axis makes an angle of 30° with respect to the incident electric field of the wave. The second sheet, B, is oriented so that its transmission axis makes an angle of 90° with the incident electric field of the wave. The incident beam has an electric field of peak magnitude Eo and average intensity So EL SO 90 What is the peak value of the electric field amplitude after it goes through sheet A? A) 0.30E B) 0.50E SA So caso C) 0.60E D) 0.75E - Socos zoo E) 0.87E - so 3 = 187 So What is the average intensity of the wave after it passes through B? A) 0.1956 B) 0.3456 C) 0.43S D) 0.505 E) zero Suppose that A and B are interchanged so that the wave is first incident upon B. What is the average wave intensity after passing through both polarizing sheets? A) 0.1956 B) 0.3456 C) 0.43S D) 0.505 E) zero
only last part of the problem

Answer 1

c)

If the wave is first incident on sheet B, no light comes from B as it is normal to the incoming wave. So, the average wave intensity after passing through both polarizing sheets is zero.

Answer: E) zero