Posted by Sivashen on Monday, March 21, 2011 at 5:23am.
The light beam is refracted twice: first going from air to glass, and then from glass to water.
Nair = 1.00 angle A1 = 46
Nglass = 1.52 A2 = ?
Nwater = 1.33 A3 = ?
Snell's Law tells you that
1.00 sin A1 = 1.52 sin A2 = 1.33 sin A3
= sin 46 = 0.7193
Therefore
Sin A2 = 0.4732 A2 = 28.3 degrees
Sin A3 = 0.5408 A3 = 32.7 degrees
Since the glass wall is a parallel slab, the angle of the beam in the water, A3, does not depend upon the index of glass, but does depend upon the index of water.
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