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A light source is located at \( P_{1} \) as shown in the figure. All sides of the polygon are equal. The intensity of illumination
\( \mathrm{P} \) at \( P_{2} \) is \( I_{o} \). What will be the intensity of illumination at \( P_{3} \)

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(a) \( \frac{3 \sqrt{3}}{8} I_{0} \)
(b) \( \frac{I_{o}}{8} \)
(c) \( \frac{3}{8} I_{o} \)
(d) \( \frac{\sqrt{3}}{8} I_{0} \)
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