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Four polarizers are placed in succession with their axes vertical, at $30.0 ^\circ$ to the vertical, at $60.0 ^\circ$ to the vertical, and at $90.0 ^\circ$ to the vertical.

  1. Calculate what fraction of the incident unpolarized light is transmitted by the four polarizers.
  2. Can the transmitted light be decreased by removing one of the polarizers? If so, which one?
  3. Can the transmitted light intensity be extinguished by removing polarizers? If so, which one(s)?

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

Quick Answer: 
  1. 21.1%
  2. remove the 2nd or 3rd polarizer
  3. remove both the 2nd and 3rd polarizer, resulting in two crossed polarizers

Giancoli 7th Edition, Chapter 24, Problem 72


Chapter 24, Problem 72 is solved.

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