A small underwater pool light is 1.26 m below the surface of a swimming pool. What is the radius of the circle of light on the surface, from which light emerges from the water? (nwater = 1.333).
a. 0.77 m
c. 1.13 m
b. 0.57 m
d. 1.43 m
Question 2
When a wool blanket is used to keep warm, what is the primary insulating material?
a. wool
b. air
c. the trim around the edge of the blanket
d. a thin layer of aluminum foil (usually not apparent) inside the blanket
