When a wave undergoes reflection at an interface from rarer to denser medium, adhoc change in it...

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When a wave undergoes reflection at an interface from rarer to denser medium, adhoc change in its
\( \mathrm{P} \)
phases is:
W
(1) \( \frac{\pi}{2} \)
(2) \( \pi \)
(3) 0
(4) \( \frac{\pi}{4} \)
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