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  4. Total internal reflection is the phenomenon of reflection of light into denser medium at the interface of denser medium with a rarer medium. Light must travel from denser to rarer and angle of incidence in denser medium must be greater than critical angle (c) for the pair of media in contact, we can show μ=(1/ sin c). Critical angle for water air interface is 48.6°. What is the refractive index of water?

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Q. Total internal reflection is the phenomenon of reflection of light into denser medium at the interface of denser medium with a rarer medium. Light must travel from denser to rarer and angle of incidence in denser medium must be greater than critical angle $(c)$ for the pair of media in contact, we can show $\mu=\frac{1}{\sin c}$.
Critical angle for water air interface is $48.6^{\circ}$. What is the refractive index of water?

Ray Optics and Optical Instruments

Solution:

Critical angle i.e., $\mu=\frac{1}{\sin C}=\frac{1}{\sin 48.6}=\frac{1}{0.75}=\frac{4}{3}$.