A beam of parallel rays of diameter ' \( b \) ' propagates in glass...

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A beam of parallel rays of diameter ' \( b \) ' propagates in glass at an angle \( \theta \) to its plane. Find the diameter of the beam when it goes to air through this face. \( \left(n_{\text {glass }}=n\right) \)
\( \mathrm{P} \)
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