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For a transparent medium the angle of polarisation is 60°. The refractive index of this medium is

Asked in GSEB Board March 2016 · Brewster's law and polarisation by reflection

• (1) 1.330
• (2) 1.500
• (3) 1.732
• (4) 1.650

Step-by-step solution

Why the other options are wrong

• (1) 1.330 is the refractive index of water, whose polarising angle is about 53°, not 60°.
• (2) 1.500 is ordinary crown glass, with a polarising angle of about 56°.
• (4) 1.650 would put the polarising angle at about 59°; only tan 60°=1.732 matches the 60° given.

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