An oil layer that is 5.0 cm thick is spread smoothly and evenly over the surface of water on a windless day. A light ray from the air above enters the oil at 45 with the normal and then goes into the water.
What is the angle of refraction of this ray in the water? The index of refraction for the oil is 1.15, and for water it is 1.33.
A) 27 B) 36 C) 32 D) 39
Question 2
An electron has a speed of 0.783c. Through what potential difference would the electron need to be accelerated from rest in order to reach this speed? The rest mass energy of an electron is 0.511 MeV.
A) 310 kV
B) 260 kV
C) 360 kV
D) 400 kV