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Natural light falls on a system of thre...

Natural light falls on a system of three identical in-line Polaroids the principle direction of the middle Polaroid forming an angle `varphi = 60^(@)` with those of two other Polaroids. The maximum transmission coefficient of each Polaroid is equal to `tau = 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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