Question

A ray of light is travelling from glass of refractive index \( \frac{3}{2} \) to water of refractive index \( \frac{4}{3} \). What is the minimum angle of incidence for which no light enters into the water?

• A. \( i_c = \sin^{-1}\left(\frac{9}{8}\right) \)
• B. \( i_c = \sin^{-1}\left(\frac{8}{9}\right) \)
• C. \( i_c = \sin^{-1}\left(\frac{2}{3}\right) \)
• D. \( i_c = \sin^{-1}\left(\frac{1}{2}\right) \)

Hint:

Total internal reflection occurs only when light travels from denser to rarer medium.

Answer 1

The Correct Option is B