Total Internal Reflection — Prelims Questions

A ray of light is incident on the interface of two media at the critical angle. What is the angle of refraction?

A light ray travels from water (refractive index $n_w = 4/3$) to air (refractive index $n_a = 1$). What is the critical angle for the water-air interface?

Which of the following phenomena is NOT an application or consequence of Total Internal Reflection?

Light travels from a medium with refractive index $n_1$ to another medium with refractive index $n_2$. If $n_1 > n_2$, under what condition will Total Internal Reflection occur?

A fish in water ($n=4/3$) looks at a bird in air ($n=1$). If the bird is at an angle of $60^circ$ with the normal to the water surface, will the fish see the bird? (Assume the bird is far enough for parallel rays to be considered).

A prism is used to turn a beam of light by $90^circ$. If the refractive index of the prism material is $1.5$, what is the minimum angle of incidence on the hypotenuse face for Total Internal Reflection to occur, assuming the prism is in air?