What will be the value of \( { }_{1} n_{2} \) for the given figure?...

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What will be the value of \( { }_{1} n_{2} \) for the given figure?
\( \mathrm{P} \)
W
(1) \( \frac{\sqrt{3}}{2} \)
(2) 0
(3) \( \frac{1}{\sqrt{2}} \)
(4) \( \frac{1}{2} \)
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