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Ray Optics: Total Internal Reflection

Q- A layer of unknown liquid is held on a flint glass slab with an index of refraction 1.65. A ray of light is falling on the glass liquid interface from below and the critical angle for the interface is 530.

(a) What is the refractive index of the unknown liquid?

(b) If the liquid is removed, what is the angle of incidence for total internal reflection?

(c) For the angle of incidence found in part (b), what is the angle of refraction of the ray into the liquid film?

(d) Does a ray emerge from the liquid film into the air above?


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