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If ray R1 is incident at the polarizing angle, which of the following rays are unpolarized?

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If ray R1 is incident at the polarizing angle, which of the following rays are unpolarized?

(a) R1

(b) R2

(c) Both R2 and R3

(d) Both R1 and R3
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Right option is (d) Both R1 and R3

Best explanation: The incident ray is incident at an angle 57.5° which is the polarizing angle of the glass. Thus the reflected light is completely plane polarized, while the other two are not.
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