Download Light of Wavelength - Optics and Modern Physics - Solved Past Paper and more Exams Physics in PDF only on Docsity! Puysics 228
4 se Commen hour exam
Feb 23, 201%
Which of the following is true?
Light is a wave, not a particle.
Light is a particle, not a wave.
Light can be a particle or wave depending on how it is produced.
High energy light like X-rays and y-rays are particles, but low energy
light like radio waves and microwaves are waves.
All light has particle and wave properties, independent of energy or
production mechanism.
See lecture notes!
Some light of wavelength A = 600 nm in water (n = 1.333) passes from the
water into air. What is its wavelength in air? ai c
a) 600 nm ‘A= n
b) 450 nm
800 nm ; \33
Oy .
d) It depends on the angle of incidence with the water-air boundary. ‘Naie 600%
e) The light will not pass into the air, it will always be totally internally > R00 nm
reflected and stay in the water.
A beam of light in water (to the left, n = 1.333) in a fish tank is incident
on the glass wall (to the right, n = 1.54) of the tank at some angle. Which
picture is qualitatively correct?
SneWs Law
or
My
Ny singe = NO SINGS SING = O86 5iNO
n: Heace
©o sin) 2 Sin Bo \
no Sin @r = SIN BoC Oy
No
1.333
222 sin 81 = 510 Go
[gs
4. You see swimming goggles at the bottom corner of a pool when you look
down at the pool’s surface at an angle of 60° below horizontal. The goggles
appear to be 1.00 m underwater. How deep is the water? (woier = 1.33)
a) 100m
b) 2.03 m
c) 049m
qd) 0.70 m
1.43 m
a) M = —2 is not possible.
(B) s=3f/2
ce) s=f/2
d) s=2f
e) s=-3f/2
6. For a convex spherical mirror, the image ...
a) is real and upright.
b) is real and inverted.
is virtual and upright.
D)
e) does not exist.
is virtual and inverted.
@=22°
tan es= Dh
x
Me-22- 5
S
Ayte.t
s 25 ££
2.4
23 £
Lista 30 = 4 21.33. sin @
2
\
, tan GOS —
x
We tan 8 2 1.u3 m
5. A concave spherical mirror has a focal length f. At what position s of the
object will the image have magnification M = —2?
7. In a double-slit experiment, the two slits are spaced 0.1 mm apart, and a
screen is at a distance of 1.0 m. H yellow light with a wavelength of 600 nm
is used, what will be the spacing between adjacent bright lights? (Assume
the angle is small.)
(a) 6 mm
b) 12mm
c) 60 mm
d) 1.0mm
e) 0.16 mm
“i
Y=
DR
a
mr =dasin Y 2 Rian@
mrad *
KR
RR _ 600nm.-
a to 4
6.108 nm
tanto
tan® =sind=
for small &
15. As shown, a picture of a person is placed facing a convergent lens, at a
distance greater than the focal length of the lens. What does the image
look like, viewed from beyond the image. (Further away from the lens.)
Viewer
Yoo t Rg
d) © 8)
A veal (mage
is lavertea but not reversed beck te front
Made by me
16. The woman in the drawing (thanks to Google Sketchup) is wondering why
the mirror reverses her left/right, but not up/down. What would you tell
her?
a) It’s because your eyes are left
/ right, not up/down.
b) It does reverse you up / down
if you turn sideways.
a It doesn’t reverse you left / right
or up/ down, it reverses you
front / back.
d) It does reverse you up / down
toa.
e) Because the real world is three
dimensional but the mirror is
only two dimensional.
See \ecture notes \
