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Q.

A horizontal beam of vertically polarized light of intensity 43 W/m² is sent through two polarizing sheets. The polarizing direction of the first is 60⁰ to the vertical, and that of the second is horizontal. What is the intensity of the light transmitted by the pair of sheets? (in W/m²)

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a

7.2

b

6.5

c

5.5

d

8.1

answer is C.

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Detailed Solution

$\begin{array}{l} I = I_{0} \cos^{2} θ_{1} \cos^{2} θ_{2} = 43 [\frac{1}{4}] (\frac{3}{4}) \\ = 8 .1 W / m^{2} \end{array}$

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A horizontal beam of vertically polarized light of intensity 43 W/m2 is sent through two polarizing sheets. The polarizing direction of the first is 600 to the vertical, and that of the second is horizontal. What is the intensity of the light transmitted by the pair of sheets? (in W/m2)