Question

You shine your laser pointer through the flat glass side of a rectangular aquarium at an angle of incidence of 45 degrees. The index of refraction of this type of glass is 1.55.

A. At what angle from the normal does the beam from the laser pointer enter the water inside the aquarium?

B. Does your answer to part a depend on the index of refraction of the glass?

Answer 1

The answer is 32.1. But I don't know how to get the answer. Please Help.

Answer 2

n1sinQ1 = n2sinQ2 for air/glass interface

Angle = 27degrees which is sinQ2

n2sinQ2 = n3sinQ3 for glass/water interface