A person looks horizontally at the edge of a swimming pool. If its length is 5 m, and the pool is filled to the surface, to what depth (in m) could the observer see? (n for water is 1.33)
a. 3.2
b. 4.4
c. 2.1
d. 1.0
e. 0.3
Question 2
Six trillion miles is equivalent in distance to one ______________.
a. light-year
b. astronomical unit
c. parsec
d. billion meters