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A glass cylinder of 2 cm radius and index of refraction 1.52 is surrounded by a...

A glass cylinder of 2 cm radius and index of refraction 1.52 is surrounded by a cylindrical plastic shell of index of refraction 1.40. Light is emitted from a source within the glass cylinder. For what range of angles relative to the cylinder axis will the light not escape the glass? Answer is < 22.9 degrees but please show work and explain

a) < 22.9 degrees

b) > 22.9 degrees

c) < 67.1 degrees

d) > 67.1 degrees

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