The top of a swimming pool is at ground level. If the pool is 2.90 m deep, how far below ground level does the bottom of the pool appear to be located for the following conditions? (The index of refraction of water is 1.333.) (a) The pool is completely filled with water. _____m below groundlevel. (b) The pool is filled halfway with water. _____m below groundlevel.

A catfish is 1.8 m below the surface of a smooth lake. (a) What is the diameter of the circle on the surface through which the fish can see the world outside the water? (b) If the fish descends, does the diameter of the circle increase, decrease, or remain the same? Assume that the index of refraction of water is 1.333.

Light from a medium with index of refraction n1=2.49 passes into a medium with index of refraction n2=1.10. What is the critical angle where incoming light would all reflect off of the boundary, without passing into the second medium? Answer in degrees, °, measured from the normal.

A ray of light travels through air until it strikes the interface between the air and another medium. The incident ray makes an angle of  ?1 = 34.0°  with the normal, as shown in the figure below. Upon passage into the second medium, the ray is refracted, emerging from the interface at an angle  ?2  with respect to the normal. A light ray in air is moving down and to the right and is incident on a second medium. It makes an angle ?1 with the vertical. Inside the vertical, it continues to move down and to the right but at a steeper slope than the incident ray. It makes an angle ?2 with the vertical. (a) Suppose that the second medium is flint glass. What is the angle of refraction,  ?2  (in degrees)? (Enter your answer to at least one decimal place.)  ° (b) Suppose that the second medium is fused quartz. What is the angle of refraction,  ?2,  in this case (in degrees)? (Enter your answer to at least one decimal place.)  ° (c) Finally, suppose that the second medium is ethyl…