A glass optical fibre ( n = 1.49 ? 1.51 for visible light) is submerged in water

Question

A glass optical fibre (n = 1.49 ? 1.51 for visible light) is submerged in water (n = 1.331 to 1.340 for visible light). What is the critical angle for light to stay inside the fibre? (Enter your answers to one decimal place.)

Answers of crictical angles to one decimal place for both red and blue lights.

For red light....

For blue light...

The question below is a multiple choice question

Is it higher for red or blue light?

a) The critical angles are equal for red and blue light.

b) The critical angle is higher for red light.

c) The critical angle is higher for blue light.

Explanation / Answer

using Snell's law

n1*sin(?1) = n2*sin(?2)

Let's make n1 glass and n2 water. The critical angle is when ?2 = 90

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