An unpolarised beam of intensity \( I_{0} \) is incident on a pair of Nicols prisms making an an...

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An unpolarised beam of intensity \( I_{0} \) is incident on a pair of Nicols prisms making an angle of \( 60^{\circ} \) with each other. The intensity of light emerging from the pair is
(a) \( I_{0} \)
(b) \( I_{0} / 2 \)
(c) \( I_{0} / 4 \)
(d) \( I_{0} / 8 \)
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