What is the critical angle for the interface between water and diamond?

33 degrees
90 degrees
57 degrees
0 degrees
98 degrees

33 degrees

Explanation:

The critical angle for a light ray moving from a denser medium with refractive index to a second medium with refractive index is given by

In this case, the critical angle occurs when light moves from diamond to water. The index of refraction of the two materials are:

for diamond

for water

So the critical angle is

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