Question

A ray of makes a transition from water (n=1.33) to air (n=1.00)
with an incident angle of 85.0 degrees **with respect to the
surface.**Find the angle of refraction with respect to the
normal as is conventional.

Answer #1

The angle with respect to the normal is the complement of the given,

Ai = 90 - 85.0 deg = 5.00 degrees

Thus, note that from Snell's law,

n1sin(t1) = n2sin(t2)

where

n1 = index of refraction of first medium =
1.33

t1 = angle of incidence = 5
degrees

n2 = index of refraction of second medium =
1

t2 = angle of refraction

Thus,

**t2 = 6.66 degrees
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