The first critical angle is defined as the longitudinal wave incident angle which results in:

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Q. The first critical angle is defined as the longitudinal wave incident angle which results in:

(A) A refracted longitudinal wave of ninety degrees
(B) A refracted shear wave of ninety degrees
(C) Complete reflection of the shear wave
(D) None of the above

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✅ Correct Answer: (A) A refracted longitudinal wave of ninety degrees

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