A light ray passes from air through a thin plastic slab (n = 1.3) ...

[cabate]

A light ray passes from air through a thin plastic slab (n = 1.3) with parallel sides. If the ray in air makes an angle of 67 with the normal after leaving the slab, what is the angle of incidence for the ray in air as it impinges upon the other side of the slab?
 a. 33
  c. 58.5
  b. 67
  d. 45

Question 2

The observation that materials expand in size with an increase in temperature can be applied to what proportion of existing substances?
 a. 100
  c. few
  b. most
  d. none

[shaikhs]

Answer to Question 1

B

Answer to Question 2

B

[cabate]

Both answers were spot on, thank you once again

[shaikhs]

Great! Please up vote