An optic fiber is made of clear plastic with an index of ...

[natalie2426]

An optic fiber is made of clear plastic with an index of refraction of 1.50. For what range of angles of incidence  with the lateral surface of the fiber will light remain inside the plastic guide if it is surrounded by air?
 
  A) 21.1 <  < 90
  B) 23.4 <  < 90
  C) 38.3 <  < 90
  D) 40.3 <  < 90
  E) 41.8 <  < 90

Question 2

Lucite has an index of refraction of 1.50. What is its critical angle if it is in air?
 
  A) 1.16
  B) 15
  C) 41.8
  D) 65.2
  E) 87.4

[AngeliqueG]

Answer to Question 1

E

Answer to Question 2

C

[natalie2426]

Both answers were spot on, thank you once again

[AngeliqueG]

Great! Please up vote