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Q.

An unpolarised light is incident on a plate of refractive index 3 and the reflected light is found to be completely plane polarised. The angles of incidence and refraction are respectively

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a

tan−1⁡32,30∘

b

sin−1⁡13,45∘

c

300, 600

d

600, 300

answer is A.

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Detailed Solution

Incident polarizing angle
i=θP=tan−1⁡(3)=60∘;

sin⁡isin⁡r=3 ⇒sin⁡60∘sin⁡r=3 ⇒r=30∘

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An unpolarised light is incident on a plate of refractive index 3 and the reflected light is found to be completely plane polarised. The angles of incidence and refraction are respectively