Author Question: Choose the lens having the shortest focal length. a. b. c. ... (Read 111 times)

neverstopbelieb · **on:** Jul 28, 2018

Choose the lens having the shortest focal length.

a.

b.

c.

Question 2

A 0.20-km wide river has a uniform flow speed of 3.0 m/s toward the east. A boat with a speed of 8.0 m/s relative to the water leaves the south bank and heads in such a way that it crosses to a point directly north of its departure point. How long does it take the boat to cross the river?
a. 29 s
b. 23 s
c. 25 s
d. 27 s
e. 17 s