PHYSICS 8B – Notes to help you prepare for Midterm 2
Things you need to know for the second midterm
:

EM waves
(Maxwell’s equations, wave number, wavelength, frequency, Poynting vector, the
sinusoidal form of E and B fields of an EM wave, wave intensity and power)

Reflection
and
refraction
(Snell’s law)

Ray tracing
with lens and mirrors (bring straight edges to the exam)
 Know how to
derive
the formulas of
double slit diffraction
and
thin film interference
.
 Formula for
resolvability
for diffraction grating
 slit:
° ≈
sin
°
=
?
±
where
°
is the angular separation of the 2 objects (light sources), measured from the central peak
to the first minimum on the screen,
±
is the width of the slit
 circular aperture:
° ≈
sin
°
=
1.22
?
²
where D is the aperture diameter.
 Time dilation and length contraction
Thin Films
:
There are two things related to interference patterns:
1. path difference
2. phase difference
The
path difference
for thin film interference is 2d, where d is the thickness of the film.
In the picture I’ve inserted here, let’s say
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 Spring '10
 CatherineBordel
 Physics, Light, Wavelength, phase difference

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