Natural light falls on a system of three identical in-line Polaroids, the principal direction of the middle

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Natural light falls on a system of three identical in-line Polaroid’s, the principal direction of the middle Polaroid forming an angle ф = 60° with those of two other Polaroid’s. The maximum transmission coefficient of each Polaroid is equal to τ = 0.81 when plane-polarized light falls on them. How many times will the intensity of the light decrease after its passing through the system?
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Physics

ISBN: 978-0077339685

2nd edition

Authors: Alan Giambattista, Betty Richardson, Robert Richardson

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