I am stuck on the second part of this exercise. Please solve both and let me know if my first answer is right also solve the second and highlight both answers. Thank you.

(a) A small light xture on the bottom of a swimming pool is 1.32 m below the surface. The light emerging from the still water forms a circle on the water surface. What is the diameter of this circle? (Give your answer, in m, to at least two decimal places.) _m (b) What If? Ifa 2.38 cm thick layer of oil (\"oil = 1.35) is spread uniformly over the surface of the water, what is the diameter of the circle of light emerging from the swimming pool? (Give your answer, in m, to at least two decimal places.) Em