Situation 18.1
A tank holds a 1.44 m thick layer of oil that floats on a 0.96 m thick layer of brine.Both liquids are clear and do not intermix.Point O is at the bottom of the tank,on a vertical axis.The indices of refraction of the oil and the brine are 1.40 and 1.52,respectively.
-In Situation 18.1,a ray originating at O,crosses the brine-oil interface at a point 0.60 m from the axis.The ray continues and emerges into the air.The angle that the ray in the air makes with the vertical is closest to:

Question

Quizplus · Accepted Answer

The ray in the air makes an angle of 48° with the vertical.This is because the ray undergoes refraction at the brine-oil interface and again at the oil-air interface. The net effect of these refractions is to bend the ray towards the normal at each interface. The angle of incidence at the brine-oil interface is 30°, and the angle of refraction is 20°. The angle of incidence at the oil-air interface is 20°, and the angle of refraction is 48°.

Situation 18.1 A Tank Holds a 1.44 M Thick Layer of Oil