When a longitudinal wave is incident upon an inclined interface and is refracted at ninety degrees, the angle of the incident longitudinal wave is called:

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Q. When a longitudinal wave is incident upon an inclined interface and is refracted at ninety degrees, the angle of the incident longitudinal wave is called:

(A) The Snell constant
(B) The Snell angle
(C) The mode conversion constant
(D) The first critical angle

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✅ Correct Answer: (D) The first critical angle

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