A ray of light travels from air to water to glass and again from glass to air. Refractive index of water with respect to air is 'x', glass with respect to water is 'y' and air with respect to glass is 'z'. Which one of the following is correct?

Step-by-step solution

Let the absolute refractive indices of air, water, and glass be n_a , n_w , and n_g respectively. Refractive index of water with respect to air is x = n_w n_a Refractive index of glass with respect to water is y = n_g n_w Refractive index of air with respect to glass is z = n_a n_g Multiplying the three equations, we get: x y z = n_w n_a n_g n_w n_a n_g x y z = 1 Answer: xyz = 1