Question: the question 14. What is the first critical angle? a) When the refracted longitudinal wave is at 90 b) When the refracted shear wave is

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14. What is the first critical angle? a) When the refracted longitudinal wave is at 90 b) When the refracted shear wave is at 90 c)When the reflected wave is at 90 d)When the incident wave is at 90

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