20 REFLEXION REFRACCION POLARIZACION
n tr tr o u c ci ci 6 Hu ma Ma
20.2 P r 20.3 20.4 20.5
Re
o nd nd a
electromagneticas
,c
20.6 tl
'}O.
20.7
onda
P ro ro p g ac ac i6 i6 n
electro electromagn magnetic eticas as
me
Di
20 12
20.10
D ob ob l
20.11
A c v id id a
Reflexi6n
20.1'
rOll(l.ga rOll(l.ga i6n
r e r ac ac ci ci 6 6p In
mNlio
II()
mo
tali 'a
h()IIWVI IWO
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TUTU',
2(). 2().
ron,
7f/nICClOl1,
polar polar ioeion ioeion
(20.2
Intr Introd oduc ucci ci6n 6n
Principio
(J.t.!)
de H u y g e n s
80
ll ie
ig
a, b,
o n ddaa s s e cu cu n ddaa r ia ia s
(indi-
l'I1,IIIS
tlculns
trornagneticas II traves
x ub ub si si gu gu ie ie nt nt e
pi
de reiraccion,
reflexion
ond
( :1 :1 11 11 \
que
r e fr fr a ct ct a d
segundo
"II
1.1l
otros,
la e ne ne rg rg ia ia .
ru
IS
nd
Sf
La supe superf rfic icie ie
C ua ua nd nd o
ib e s d ec ec ir ir , e s e la la st st ic ic a
IIIIlO,
vncio d e pola polari riza zaci cion on
de
de medi medio, o, Esta Esta repr repres esen enta taci cion on
mdn II nuda nuda "'\lIi 1 1 1 1 e ue ue rp rp o in
r e flfl e ja ja d a
IIl10Va
IlllgIlllg-and ando. o. La o n d
1:,1ll
u pe pe rf rf ic ic i
IIHillIS
na on
e le le ct ct r
a gn gn et et i
II
en este este capi capitu tulo lo
ig.
0-1.
Construcci6n
10
le
20.2 20.2
in ipio ipio
yg
('III'!!'
prnpagan en la mate materi ria, a, requirio
1.11
tN
'(~ I.()~ I.()~ 10 tan~o, (',lpJ.O,seguir
id
to
ultimo
et im
lo
un la
('udos ie
Hill
h uc uc e
i gl gl o
i nt nt u t i
JlOl'
SI
~~)~
rela-
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(20.3
Te
ma
Ma
80
pongamos ,o
t,
la
P,
ucamente,
as I",(Q
te a-
i)
-~-_~--~....
unCl unClOn On qu al instante t. Supongamos dS a l I·,
de Ia supe superf rfic icie ie que P. La
perturbacion
en
in
tante
~p(i)
g(6)
(a)
dS, F Ig Ig .
(c)
(b)
n da da s p la la na na s
20
o nd nd a
e st st er er ic ic a
o nd nd a
or
a r i tr tr ar ar ia ia .
(20.2) se pued pued
1"1101'. 20-2. elll ular
ic
los
llaman rayos
S,
instan ante te dS al inst 11Ista~te t, (1 t~
t dS hasta
r~v
g(6) g(6)
1.11
g(6)
do hudll adelanto,
!(1
nsan
act'
la amplitud
Ul
n em em o
es
e rp rp e
d'
ue
(g minima
(g
rayo
n,
podemo$___oblener .!_a perturbacion ad m en en l d e U J ilCT, =
pr?pagahcl.~n ci
u ppee r _ z c z e ce
de la
c o rr rr es es p on on d ie ie n te te s . sd S" el
0)
entr entr
'r
1-
cos 6)
HII'us
II
llnman p u nt nt o
dS dS
11
1'1'It(/1l
al P. El
la rela relaci ci6n 6n
linens
1>(1
t'
e l1 l1 1[ 1[ 1o 1o q u e s _e _e [U [U Jr Jr ap ap un un ta ta s mi mo as
aa
c Q r es es po po nd nd ie ie a e . R LR LR a bb
CC",
de do
s up up er er f c ie ie s QI
de
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8()O
Ref/exlon,
r e r ra ra c c i a n , p o l a r iz iz a c io io n
(20.4
do
Reilexion
0.4)
'"YO li
1.
s , Rl ben
Itci
otra s up up e f ic ic i
de
nd
n;
RI
S',
RI tambien
R2 s e
p e p e d ic ic ul ul ar ar e
a n t ra ra ns ns fo fo r S'.
I-;;-" lO
palabras,
Rayo Rayo refract refractado ado
acon o r o go go na na l d a c on on se se ro ro a traoes pngu pngu desd desd qu pondientes).
refleja reflejado do
medio, Entonsu su
la
',
p la la nnaa s
ic
su
fiCIOS
Ray
incidente1
r e r ac ac c o n d e o nndd a
Al hasta
en
ra os
el
Al
r. 20-6.
rofractado A2 hasta Az(que
20.4 20.4 Rejl Rejlex exi6 i6
s-
rejr rejrac acci ci6n 6n de onda onda plan planas as
lOll
rnedios,
du versor Ui supe superf rfic icie ie plan plan
AB
refractadas reflejadas, u-, diferente u~simetrico
I.
to
ie 0i,
(b)
(a)
[limll
(a) Rayo Rayo incl inclden dente, te, reflej reflejad ad
por un hloq hloque ue de
refra refracta ctado do (b dr o. (De: (De: Physics, D.
Heath Heath
luz reflejado Bosto Boston, n, 96 ,)
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8()8
R e {l {l ex ex I6 I6 n ,
r ef ef ra ra c ci ci on on ,
p o la la r iz iz ac ac io io n
(20.4
mo
sde velocidad VI' rayo rayo Ri desde
hasta B' e g
Reflexion
0.4)
e f a cc cc io io n
A" co
t,
BB'
velo veloci cida da t,
AA'
vI'
AA"
(1)
Entonces: e,
v1t,
(2)
de
Fig.
sen 0i sen Or
BB' AA'
21
IH
critico A,
0i
:;
tuucion
espe especi cial al
IIht. n o m o s
VI
(20.8)
sen Or.)) vI'
flg.20-8.En el segu segund ndOO-ca caso so
con 10 cual cual resu result lt es1; es1;oes, oes, 21
Cuan Cuando do
sen 0i
(20,9)
21
ec
1t/2
10
0i
sen Or
lillI/lila
'I
[o
oldades
reflexion
21
angulo
sen 0i
f!
r>
sen 0i
La
0-9.
refract refractado ado
V2t
I)
r>
Ray
<1
n2
cuando
yn21
VI
V1t
sen O r _ -
80!)
p la la nnaa s
e l r ay ay o
'011
hasta
d e o nndd a
que el
od
/121
crttico 1, tenem tenemos os
A.
A 6
sen Oi
re{feiwn total.
IIII1A
1'
de 10 tu
lI
-
(20.5)
II
hablando,
1, deciejemplo, ue tr Or
iayo co
'poi
In fig,
IIwllt
esta decr decrec ec
uy rapidamente
medida
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'flexion.
10
reiraccion,
(20.5
polarizacion
(a)
se
Physics; D. C.
IIoath, Boston,
tl mtonto
tr sen 6 1 cos
'I'am 'I'ambi bien en se puede ater ater ales ales
comprobar comprobar Iacllme Iacllmente nte que si s e erne ernerg rgen ente te cont contin inua ua
11 10
20;5 20;5 R'ejl R'ejlex exi6 i6
IRefleXiO/l
e frfr ac ac ci ci o
(b)
1!'lg. 20·10 (I))
.6
rejracci6n
de
sien siendo do para-
(a)
d e o tu tu la la s
s fe fe r c a
8/1
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ci o n flex flexio ion, n, r e frfr a c ci
p o la la r iz iz a ci ci o n
(20.6
specto to al rayo rayo refr refrac acta tado do Be vemo vemo qu cuan cuando do 10 .I spec
mtorcepta.a la norm normal al OA ABIAO. POl' 10 tanto
te
ABIAI.
0.(1)
~;
sea
(20.10)
AO
21•
) hl hl ll ll lr lr ve ve s q u elm,
It Ln ctrico
tg
Ahora (I
te ~or sen
AI
tg
ed
se l'
cons consta tant nt en
It ( U O S
II
813
cc
reflexion
ta
Tarnhien
AO
AI
Ma
~~
sen (k;·
e mo mo s u sa sa d
la
is
wi
(20.13)
wi).
(20.14)
co
rnovirefraccion, ca
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81
l te te flfl ex ex i6 i6 n
r ef ef ra ra c ci ci on on , p ooll ar ar iz iz ae ae io io n
(20.6
Mas
20.6)
llJ Refractada Reflejada
~r
(1) (2)
llg g
da
IOJE IOJEMP MPLO
punt punt un
20.2
de un tens tensi6 i6
tran tran
rsal rsales es
en
os
uerd uerd
ni as de di re te
Estu Estudi diar ar la refl reflex exio io la tran transm sm de do cuer cuerda da de ater ater ales ales dife difere rent ntes es
So cc on Su onga onga os qu tene tene os do cuer cuerda da (1 punt punto; o; este este unto unto sera sera nues nuestr tr or ge deco decoor orde dena nada das. s.
dens dens ades ades
de onda onda tran transv sv rsal rsal el La cuer cuerda da esta esta so et da (2 (fig (fig -15) unid unidas as en un maternaPOl' conveniencia
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8/()
1l 'flexion, 'flexion,
reiraccion, polarizacion
(20.6
Reflexi6n
20.7) la
do
e xp xp re re s o ne ne s
a nt nt er er io re re s
ac 6n
de
de
g ua ua la la nd nd ol ol a
n da da s
electromaqneticas
d es es pu pu e
de el
na
81'1 e l f ac ac to to r
comun cos osi, obtenernos (20.21)
(a)
l m u es es t
(20.20)
se ci be sf er Ia na ur le f is ic a d e l a o nd nd a e so so l e nd nd o (20.21), obtenemos,
e l s is te te m
Transmitida (10)'lnl
st d e e cu cu ac ac io io ne ne s
(20.22)
(1)j"Nn#w j"Nn#w."/'W",*_ .• t ' @ / ' ~ i l ! ! Y , ! E ' A ! E k ' ! E " d ! E " ' ! E Y i l l ! " " mmmmm~jIIIIIiIIII'_.mmm_(2) Transmitida'
Reflejada
(d)
da
os]», podemos escribir (e)
~
_
~I
VI
om
e n e l e as as o d e o nd nd a
.V
VI
t ra ra ns ns ve rrs s al al e
en un
(20.23)
VI V2
c ue ue rrd da
VI'/m,
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8/8
Heffc.ti
polarizacion
(20.7
Re ex on
:J().7)
I pl pl a
en ncc i
cos ar. It uemos I IH IH ta ta ec ec ua ua ci ci o
r e r ac ac c o n d e o nd nd a an
e c (20.25), sen at sen 2a
(20.8), ai cos ai
d a 2a
rr
sen
cos
2B
Bi
sen 2a B,
e le le c r om om aq aq ne ne t c a cos sen 0 , . ,
rc/2,*
wa re(rl!-ci re(rl!-ciado ado son .p_g:_p_endiculares, .p_g:_p_endiculares,..e~ . .e~ rayo r e ilil e ja ja d o e s t _ tO tO ~ ( 1 ?! ?! ! !-!- .~ .~ r : _ _ t!t! :.:. ._ ._ p y ? a ri ri za zeasdao nd n, d o e l c am am p e _ e c r ic ic o p er er p en en d ic ic ul ul a ' a p la la n d e i ,!,! -! -! : ! :! :! !e !e nc nc ia ia , Ia fig. 20-19,
Elitn
III
e l t ri ri c fig. 20-19,
II'IK. 20-17.
Campos electrico
magne-
sen Br
im cos Bi
ca
an id
la
as en
te es
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82
Refle Reflexi6 xi6n, n,
una II
omponente
refr refracc acci6 i6n, n, polar polariz izaci acion on
hili
ci
ci
em
ef en
d e r ef ef le le xi xi 6
IO.IICMJ IO.IICMJ>LO >LO 20.3 C al al cu cu la la r olldu' clectromagneticas (h tncidencia de 30
lo
20-1
p ue ue de de n
se
p os os itit iv iv o 7t
Ia onda
d e o nd nd a
su orie orient ntac aci6 i6
e le le ct ct ro ro ma ma qn qn ei ei ic ic a
esta "congelada";
e n u n m ed ed i
I I I I t nto
a ni ni s6 s6 tr tr op op o
alre-
esto
propiedades
llnos 1':.1 eluucs
tr
esta
lo s c oe oe fi fi ci ci en en te te s embargo, . lo u n d r ef ef le le ja ja d lucid nte.
~"lut)'l ~"lut )'l 6n:
P ro ro pa pa ga ga ci ci 6
:J().8)
urlcntadas ,11'1101'
cr,a,
usclla Ademas,
(20.8
segun anis6tropo.
if Cf)
e, EO
en
l,
iz ci
r:
E st st a
r:
s itit ua ua ci ci 6
es
a te te ma ma titi ca ca me me nt nt e
IIlIlY
c oe oe fi fi ci ci en en te te s region
tenemos
nvidrio
d e r ef ef le le xi xi 6
un angulo 1,
momentum Ico 1'11"0
angular
l a v el el oc oc id id a
a ng ng ul ul a
OJ OJ
er
ae
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Re{lexi6n,
refraccion,
polarizaci6n
(20. (20.
0.8)
P ro ro ppaa ggaa c 6 n
d e o nndd a
e ie ie c r om om aq a q nnee i c o
e n u n m ed ed i
a n s 6 r op op o
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He(lcxiol1 He(lcxiol1 re(l'acc re(l'accion, ion, poiarizacton
(20.8
1,N)
P l'l' op op a a ci ci o
d e o n a s e le le ct ct to to m q ne ne ti ti c
e di di o anisoiropo
8211
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82
R e { le le x i6 i6 n , r e {r {r a c ci ci 6 n p o la la r iz iz a ci ci o
(20.9
.W)
D o bl bl e r ef ef ra ra c ci ci 6
82
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R e { le le x io io llll ,
r e frfr a cc cc io io n ,
p o la la r iz iz ac ac io io n
(20. (20.10 10
0.10)
Doble Doble retrac retraccic cic
29
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