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Two Nichols are oriented with their principal planes making an angle of 60°.Then what is the percentage of incident unpolarized light which will pass

through the system?



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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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