A light beam in air is incident on a plane surface of glass at an angle of to the surface. Find the angle to the surface at which the refracted beam propagates in the glass. Use a value of 1.52 for the refractive index of the glass.
In which substance from this table is the speed of light m/s?
|Gases at , 1 atm|
|Ice (at )||1.309|
A secret agent is pursued through some woodland by an armed guard carrying a gun with a laser targeting sight. The agent attempts to lose the pursuing guard by diving into a lake. While underwater, the agent sees the laser beam from the guard’s gunsight in the water near him and notes that the beam is at an angle of to the vertical. Find the angle above the horizontal at which the laser beam must be incident on the surface of the water. Use a value of 1.33 for the refractive index of water. Assume that the surface of the lake is perfectly horizontal.