Question

What is the critical angle of a light beam passed from a medium (n=2) to a medium (n=1.2)?

a. 45.0O

b. 36.9O

c. 73.3O

d. 90.0O

Answer 1

Answer:

b is the correct answer

Explanation:

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Answer 2

The critical angle of a light beam passed from a medium (n=2) to a medium (n=1.2) is 36.90⁰

Critical angle = $sin^{-1} (\frac{n_2}{n_1} )$

                      = $sin^{-1} (\frac{1.2}{2} )$

                      = $sin^{-1} (0.6 )$

⇒ Critical angle, c = 36.90⁰

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