Author Question: A plane convex lens is made of glass (n = 1.5) with one flat surface and the other having a radius ... (Read 136 times)

HudsonKB16 · **on:** Jul 28, 2018

A plane convex lens is made of glass (n = 1.5) with one flat surface and the other having a radius of 20 cm. What is the focal length (in cm) of the lens?
a. 20
b. 30
c. 40
d. 10
e. 50

Question 2

A fish is 80 cm below the surface of a pond. What is the apparent depth (in cm) when viewed from a position almost directly above the fish? (For water, n = 1.33.)
a. 50
b. 60
c. 40
d. 70
e. 110