Question

what is critical angle


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Answer 1

Answer:

here's the answer to the question

Answer 2

Explanation:

The critical angle is the angle of incidence beyond which rays of light passing through a denser medium to the surface of a less dense medium are no longer refracted but totally reflected. It is the smallest angle of incidence that yields total reflection.

One can witness an effect by opening his or her eyes while swimming just below the surface. If the water is still, the surface outside the critical angle appears mirror-like, reflecting objects below. The region above the water cannot be seen except overhead, where the hemispherical field of view is compressed into a conical field known as Snell’s window, whose angular diameter is twice the critical angle.