A ray of light, which is traveling in air, is incident on a glass plate at a 45 angle. The angle of ...

A ray of light, which is traveling in air, is incident on a glass plate at a 45 angle. The angle of refraction in the glass
 
  A) is greater than 45.
  B) is less than 45.
  C) is equal to 45.
  D) is unknown because it all depends on the index of refraction of glass.

Question 2

A bolt hole in a brass plate has a diameter of 1.2 cm at 20.C. What is the diameter of the hole when the plate is heated to 220.C? (The coefficient of linear thermal expansion for brass is 19  10-6 per degree C.)
 
  A) 1.205 cm
  B) 1.210 cm
  C) 1.195 cm
  D) 1.190 cm
  E) 1.200 cm

Question 3

A coil lies flat on a table top in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the sense of the induced current in this coil as the field fades?
 
  A) The induced current flows counterclockwise.
  B) There is no induced current in this coil.
  C) The induced current flows clockwise.
  D) The current flows clockwise initially, and then it flows counterclockwise before stopping.