Phys 375 – Monday/Wednesday sections – Prof. Fuhrer
Homework #2, due week of September 17-18, 2008
1) Pedrotti, problem 2-7:
“A small source of light at the bottom face of a rectangular glass slab 2.25 cm thick is
viewed from above. Rays of light totally internally reflected at the top surface outline
a circle of 7.60 cm in diameter on the bottom surface. Determine the refractive index
of the glass.”
2) The picture below shows the top view of a room. You are walking along the x-axis.
a) What is the set of values for x for which you can see the entire green arrow in
the mirror (blue slab at top)?
b) Draw the image of the arrow in the mirror.
3) Pedrotti, problem 2-8.
“Show that the lateral displacement of a ray of light penetrating a rectangular plate of
thickness t is given by
2
21
cos
)sin(
θ
θθ
−
=t
s
where θ 1 and θ 2 are the angles of incidence and refraction, respectively. Find the
displacement when t = 3 cm, n = 1.50, and θ1 = 50º.”
