Question

Which one is the incidence angle for total internal reflection, while the critical angle is 60°? ​

Answer 1

Answer:

Since the angle of incidence is greater the air-water critical angle of about 48°, it undergoes total internal reflection (TIR).

Explanation:

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Answer 2

Answer:

When the angle of incidence in water reaches a certain critical value, the refracted ray lies along the boundary, having an angle of refraction of 90-degrees. This angle of incidence is known as the critical angle; it is the largest angle of incidence for which refraction can still occur