Lag1989 problem number 22.20

Lag1989 problem number 22.20

Natural light is incident on a system of three consecutive polaroids, the main direction of the middle polaroid making an angle of 60° with the main direction of the other two polaroids. Each Polaroid has such absorption that when linearly polarized light falls on it, the maximum transmittance is 0.81. How many times will the light intensity decrease after passing through this system?

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