A light ray enters a glass enclosed fishtank. From air it enters ...

[abern]

A light ray enters a glass enclosed fishtank. From air it enters the glass at 20. with respect to the surface, then emerges into the water. The index for glass is 1.50 and for water 1.33.
 
  (a) What is the angle of refraction in the glass?
  (b) What is the angle of refraction in the water?
  (c) Is there any incident angle in air for which the ray will not enter the water due to total internal reflection?

Question 2

Approximately what proportion of people in the United States believe we have been visited by extraterrestrials?
 
  A) around 33 or a third
  B) about 50 or a half
  C) less than 1
  D) more than 90

[CourtneyCNorton]

Answer to Question 1

(a) 39.
(b) 45.
(c) no

Answer to Question 2

A

[abern]

YES! Correct, THANKS for helping me on my review

[marict]

Thanks for the timely response, appreciate it