Problems on Refraction
Problem 2.1:
As light moves from air (
n 1.00) to amber it deviates 18
o from its 45
o angle of
incidence. Which way does it bend? What is the speed of light in amber?
[Solution]
Problem 2.2:
A transparent fiber of index of refraction 1.6 is surrounded (cladded) by a less dense plastic of index
1.5. At what angle must a light ray in the fiber approach the interface so as to remain within the fiber?
[Solution]
Problem 2.3:
A light ray in air approaches a water surface (
n 1.33) such that its electric vector is parallel to the
plane of incidence. If
θi = 53.06o, what is the relative amplitude of the reflected beam? What
about if the electric field is perpendicular to the plane of incidence?
[Solution]
Problem 2.4:
By what angle do blue light (
λb = 460 nm) and red light (
λr = 680 nm) disperse upon entering
(from vacuum) a medium with
N = 7×1038,
ε = 1.94, and
ω0 = 5.4×1015 Hz at
an incident angle of 20
o (the electron charge is
1.6×10-19 Coulombs and its mass is
9.11×10-31 kilograms)?
[Solution]
Problem 2.5:
What is the rate of change of the speed of light with angular frequency in a dielectric medium?
[Solution]
1.00) to amber it deviates 18o from its 45o angle of
incidence. Which way does it bend? What is the speed of light in amber?
[Solution]
