Optics Question 957
Question: A point source of light is placed at a distance h below the surface of a large deep lake. What is the percentage of light energy that escapes directly from the water surface if
Options:
A) 50%
B) 25%
C) 20%
D) 17%
Show Answer
Answer:
Correct Answer: D
Solution:
[d] The solid angle subtended by area shown by the shaded portion in
