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8/17/2019 53B LIGHT Refraction Total Internal Reflection.ppt
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Total Internal Reflection and Critical Angle
Vedio
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Normal
Ray box
Semi-circular block glassi
r
i = 42o
r = 90o
i = Critical angle, c = 42o
Refractive index, n = sin ØV sin Øm
n = sin 90 = 1
sin c sin c
n = 1/(sin 42o) =
Tangent
!"en r = 90o
#"at "a$$en if i is %igger
t"an c&
'"e lig"t is reflected internalat t"e srface in a medim(glass)
*ts +no!n as 'otal *nternalReflection
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Normal
Ray boxTangent
tate t!o conditions for total internal reflection cold occr
ci
-lass. "ig" densit
ir. lo!densit
i) ig"t ra $asses from a denser medim to a less dense medim
ii) '"e angle of incidence (in t"e denser medim) is greater t"an t"e
critical angle
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'"e s"a$e of glasses.
-lass loc+
emi3circlar-lass rism loc+
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Prism: Observe the changes of the ra !hen the angle of incidence ra
in "rism is increased#
Vedio
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$
5igre a 5igre a
6
6
2 7etermine t"e critical angle of $rism !"ic" are sed
1 8o! do o ex$lain t"e condition of t"e lig"t !"ic" $asses in t"e$rism&
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%
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&
8/17/2019 53B LIGHT Refraction Total Internal Reflection.ppt
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'
(at)ral Phenomenon Involving Total Internal Reflection
1 irage (ogamaa / fatamorgana)
:%;ect(clod)
#arm air laer
(lo! densit)
Cool air laer
("ig" densit)
*mage(clod)
'"e ra from o%;ectis %ent (refracted)
:%server
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1*
2 Rain%o!
7iscss<
+ 8o! does it occr
+ '"e $"enomenon of lig"t t"at is involved
+ #" it is %eing colorfl&
,hite light from the s)n
enters the raindro"s# In the
raindro"s angle of incident
ra greater then the critical
angle of !ater- the lightreflected#
Total internalreflection
The different colo)r
of light- refracted !ithdifferent angle
de"end on the !ave
length
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7iamond
7iscss<
i) Refractive index (lo! or "ig")
ii) "enomenon of lig"t
iii) '"e effect !"en %eing ex$osed to lig"t
Lihat intan dari arang dari lumpur terpendam, lama himpitankepanasan kini barang bernilai.
Mampukah dirimu jadi seperti itu, atau dirimu hancur lebur….
.igh refractive
inde/ 0small
critical angleTotal internal
reflection
The ras are totall
reflected bac into
the diamond and
event)all e/it atthe to" s)rface to
give the diamond
its s"arle#
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The A""lication of Total Internal Reflection
1 erisco$e
:%;ect
*mage
rism
rism
:%server
7iscss<
+ '"e se of t"e device
+ '"e main com$onents and itsfnction
+ '"e arrangement of $risms
+ 8o! does it !or+
+ '"e $"enomenon of lig"t
+ C"aracteristics of image
+ '"e advantage of $risms
sed in s%marine tosee t"e "idden o%;ect
t!o 4>?/4>? $risms, itsca$a%le of %ending lig"tras t"rog" 90?'"e first $rism forms aninverted image and t"esecond $rism inverts it %ac+
to normal
'otal internal reflection
@$rig"t, same siAe as o%;ect
*mages $rodced % totalinternal reflection are%rig"ter t"an t"ose$rodced % mirrors
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2 :$tical 5i%re
7iscss<
+ '"e se of t"e device
+ '"e main com$onents
+ 8o! does it !or+
+ '"e $"enomenon of lig"t
5i%re o$tic diagnostic tools in medicineand fi%re o$tic ca%les intelecommnicationsn o$tical fi%re consists of an inner coreof "ig" refractive index glass andsrronded % an oter $rotectivematerial of lo!er refractive index
#"en lig"t is introdced into t"e innercore at one end, it !ill $ro$agate alongt"e fi%re in a AigAag $at" series of total internal reflection
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inoclar
7iscss<
+ '"e se of t"e device
+ '"e main com$onents and itsfnctions
+ '"e arrangement of $risms
+ 8o! does it !or++ '"e $"enomenon of lig"t
+ C"aracteristics of image
+ '"e advantage of $risms
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4 iccle and Car Reflector and Cat Bes
7iscss<
+ '"e s"a$e of $rism
+ 8o! does it !or+
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1$
Ilan
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1%
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1&
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1'
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2*
ag): ogamaa 0Amo
ogamaa ang tem%erang
ala" $a"am menesat+an
inar ca"a dari a!an
7i%ias+an dan di$antl+an
7ari la$isan dara +ese;+an
e la$isan dara +e$anasan
Ca"aa di%ias dan di$antl dalam ($en")
edim ang sama
e mata $er"ati
Dang +eli"atan ime; a!an3a!an
agai +olam i+an di tenga" ;alanan
+ mansia
Dea, ea"