sin p = p
p = p
PP: Single slit.!
A slit opening is a=10 m and the distance between
the slit and the screen is L=3 m. Calculate the width of
the central peak for light of wavelength 500 nm.!
A realistic doub
The propagation of electromagnetic
determined by the source!
determined by the medium!
0 = 8.85x 1012 F/m!
0= 4107 H.m-1!
c = 299,792,458 m/s ~ 3.00 x 108 m/s
Light: electromagnetic waves!
The image is virtual !
There is no light coming from
behind the mirror. If you put a
photodetector or a film at the
location of the virtual image, it
will not record any signal. Our
eyes focus the rays on the
retina and our brain thinks the
HW 4 due on Dec 1!
Late drop deadline on Nov 28!
Please dont discuss the midterm. !
Conflict exams are still ongoing.!
You will get the exam back during the lab next week!
I will be out of town Mon-Wed next week.!
Office hour on Monday next week cancelled
The Foundations of Modern Physics: the
breakdown of classical physics!
The discovery of the electron!
(J. J. Thompson, 1897)!
Rutherfords nucleus model!
The blackbody radiation!
(theory by Planck, 1901)!
a subatomic particle!
The internal structur
Double-slit experiment and diffraction
Bright fringes: !
ym=Ltanm ! m=0,1,2, !
When is small,!
Dark fringes in between!
bright fringes !
width of slit !
A realistic set of parameters: !
d=0.3 mm, L=1m,
Submit questions for Tuesdays review class before Sunday night!
HW03 due at 11:59 pm on Monday, Nov 9!
Total Internal Reflection!
n1 > n2!
c = sin
n1 sin 1 = n2 sin 2
1 > c
Rainbow (refraction and
Interference of thin film coating!
Youngs double slit experiment!
Anti-reflective (AR) thin film coating: an
example of interference!
If the reflected beams (2 and 5) from the !
Quantization to the rescue!
Blackbody radiation spectrum!
the energy of oscillators
inside a solid is quantized !
En=n hf, where n=1, 2, 3.!
The photoelectric effect!
The energy of an E&M field!
is quantized into packets !