Suppose you have an experiment set up in which a laser enters a glass of water from below at the critical angle and reflects off the water-air interface with total internal reflection. a) What is the critical angle for a water-air interface? b) Now someone pours a thick layer of oil on top of the water in your experiment. What happens? Will the laser beam still be at the critical angle? If not, what will the new critical angle be at the oil-water interface (if any)?

Suppose you have an experiment set up in which a laser enters a glass of water from below at the critical angle and reflects off the water-air interface with total internal reflection. a) What is the critical angle for a water-air interface? b) Now someone pours a thick layer of oil on top of the water in your experiment. What happens? Will the laser beam still be at the critical angle? If not, what will the new critical angle be at the oil-water interface (if any)?

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Question

Suppose you have an experiment set up in which a laser enters a glass of water from below at the critical angle and reflects off the water-air interface with total internal reflection.

a) What is the critical angle for a water-air interface?

b) Now someone pours a thick layer of oil on top of the water in your experiment. What happens? Will the laser beam still be at the critical angle? If not, what will the new critical angle be at the oil-water interface (if any)?

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