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Unformatted text preview: Principles of Physics II
PHYS 22 1246!}
Exam #4
Fall 2011 “a Nﬁmtaﬂt—wu— You may:r use the vaiues it = 8.99xlﬂ9 hi mgiCE, aﬂ = 3.35xlﬂ'13C2me2,
on = 4ox1o‘inrai, and e = Looono'lg c. You must show all of your work for full credit. 1. (5 points} A rag»r in water [n=l.33} strikes a surface with an incident angle of 210° . The refracted angle is 22.5” . What is the index of refraction for the material? .. {howl
it int—:JL Mi?!“ g:
1—.{_  ‘ x l
r :1 in item“; 1 ‘1.
AJ'H ELF LIi‘ihqb—t 1.
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j .. if. 1 1 h a 2. [5 points} A laser with an intensitg.r of ti.i‘Stlrniii'innn1 has an initial polarization that is at
an angle of lSJIIIu to the right of the yaais. A polarizer is set up that is at an angle of THU"
shotre the xaxis [negative x—axis}. What is the intensity of the laser after passing through L this polarizer? h. 3. [5 points} A convex mirror has a focal length of either +2ﬂ.ﬂcn1 or 2il.ilcrn, you decide
which is correct. There is an object with an object distance of Billions . What is the image
distance? r g ‘t
d i” 1* : t 3... i — i “‘ i
in i ‘l .—. r n ‘ .a.
'1 o n. a.
a” *3 " t L“ 4. {5 points] A certain electromagnetic wave has a frequency of 3.?5xlﬂ” Hz . What is its
wavelength, wave number and angular frequency"? If; ﬂ . '_ _ . c . "'_ u I? n: as S. (lﬁpoints) Finish the ray tracing diagram started below, The object is indicated. Draw in
the three primary rays: indicate their directions, determine where the image is, draw it in and
label it. Use dotted lines for lines that are not rays. 4:"
6. (5 points] Using only your diagram shove [Problernji explain whether the image is real
or 1ri1tua1 and how you know. Do not use or mention the Mirror Equation in your answer. . _ u ..
: '...I...« 3 ""'*~ :" ..i i'. {l 5 points) Finish the ray tracing diagram started below. The object is indicated. Draw
in the three primary rays, indicate their directions, determine where the image is= draw it in
and label it. Use clotted lines for lines that are not rays. r
3. [5 points} Using only your diagram above {Problem _.i 1'}, expiain whether the image is
real or 1virtual and how you know. Do not use or mention the Lens Equation in your answer. I.._ I . 1 ,. ..._.
I ' . ._ _.. . _ _._ . a . .. ___J 9. (it) points) An electromagnetic wave has an intensity of 3.Sllilnillill‘l‘tl'r’imI . Find the magnitude
of the rms electric and magnetic field. F'j' " "_ J 1' '~ E“ 's F” i
l
I
.. i  J y
or _.
I .
iﬁgiﬂ a! i “ 1:. 5 l...' u. n
E _v *1 r't J M . L} a, I I
' a; L: .1 r
J _ . _. .
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I 1‘ .n.l
.. r I: 't
a ;_ .  y 5 .‘ a
Fr , x.
J II x
.t F‘ _t
5 : 1+ J i _. H J lﬂ. (15 points} A layer ofethvnol [n = 1.362} lays on a surface of glass {11 = 1.523) .
a} In which material will there he total internal reflection and what is the critical angle?
h] For a ray incident in the ethynol, what is the Brewster angle for this interface? n
I
. i‘ HEMff
t "F
a .e__.
.I :~
3" L I. _,w .‘
1"— .p
._ i.
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l.
u a i'
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'I . i 5.7 *Iﬁl
L' ‘ a
rl f .. '
r i ‘—
I t it
I 1 l. (15 points} Consider a converging lens with a focal length that is either +5.ﬂﬂcm or
5.l}llcm , you decide which is appropriate. An object that is ltltlcm tell is placed liﬂcm from
Use lens. Using the lens eguation, determine the image distance, the image height, whether the
image is real or virtual. and whether the image is upright or inverted. ‘— ...
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 Spring '11
 JimGuinn

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