A 35-mm camera equipped with a 45-mm focal length lens is used to photograph a tree 15 m tall. If the aperture of the lens is set at f/2, what is the aperture diameter?
A) 14 mm B) 18 mm C) 32 mm D) 23 mm E) 27 mm
Question 2
An air bubble underwater has the same pressure as that of the surrounding water. As the air bubble rises toward the surface (and its temperature remains constant), the volume of the air bubble
A) increases.
B) decreases.
C) remains constant.
D) increases or decreases, depending on the rate it rises.