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2014-09-28T05:11:09+05:30

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From the 1st Nicol prism 1/2 the intensity of unpolarized light will pass through.
From the 2nd prism the intensity is cos² 60⁰ of the polarized light from the 1st.

So % of light (Intensity) passing through the system = 1/2 * 1/2² = 1/8 = 12.5%

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