53b light refraction total internal reflection.ppt

8/17/2019 53B LIGHT Refraction Total Internal Reflection.ppt

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1

Total Internal Reflection and Critical Angle

Vedio


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2

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


3/20

3

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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4

'"e s"a$e of glasses.

-lass loc+

emi3circlar-lass rism loc+


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5

Prism: Observe the changes of the ra !hen the angle of incidence ra

in "rism is increased#

Vedio


6/20

$

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&


7/20

%


8/20

&


9/20

'

(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


10/20

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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11

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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12

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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13

2 :$tical 5i%re

7iscss<


+ '"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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14

inoclar

7iscss<


+ '"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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15

4 iccle and Car Reflector and Cat Bes

7iscss<

+ '"e s"a$e of $rism

+ 8o! does it !or+


16/20

1$

Ilan


17/20

1%


18/20

1&


19/20

1'


20/20

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"

53b light refraction total internal reflection.ppt

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