-'"*C*& /o /o$m 5 – LIGHT 5.3 Total Total Internal Reflection (EXERCISE)
1. Wi% Wi% of te te follo folloin in opti opti%al %al inst$ inst$ume uments nts does does not fun%tio fun%tion n on te p$in%i p$in%iple ple of total total inte$n inte$nal al $efle%tion -e$is%ope A. B. 4ino%ula$s C. 5pti%al fi+$es i%$os%ope D. 2. 3. 7mon 7mon te te penom enomen enaa +elo +elo & i% i% is not not $ela $elate ted d to te te p$in p$in%i %ip ple of tota totall inte inte$n $naal $efle%tion i$ae A. B. #ain+o *k8 appea$s $ed at sunset C. D. it passin t$ou opti%al fi+$es . . Wi% Wi% of te te follo folloin in a$e te %ond %onditi ition onss fo$ total inte$nal $efle%tion to o%%u$ A. Te in%ident $a8 must t$a;el f$om a less dense medium to a dense$ medium. B. Te anle of in%iden%e must +e mo$e tan te %$iti%al anle. Te anle of in%iden%e must +e mo$e tan te C. anle of $ef$a%tion. Te $atio of te sine ;alue of te anle of D. in%i in%ide den% n%ee to te te sine sine ;alu ;aluee of te te anl anlee of $ef$a%tion is a %onstant. 6. <. Te %$it %$iti%a i%all anle anle fo$me fo$med d at te te +ounda +ounda$8 $8 of ai$ ai$ and lass is te A. minim minimum um anl anlee of in%i in%ide den% n%ee +efo +efo$e $e tota totall inte$nal inte$nal $efle%tion $efle%tion o%%u$s en lit t$a;els t$a;els f$om lass to ai$& B. ma=i ma=imu mum m anl anlee of in%id in%iden en%e %e +efo +efo$e $e total total inte$nal inte$nal $efle%tion $efle%tion o%%u$s en lit t$a;els t$a;els f$om lass to ai$& C. minim minimum um anl anlee of in%i in%ide den% n%ee +efo +efo$e $e tota totall inte$nal inte$nal $efle%tion $efle%tion o%%u$s en lit t$a;els t$a;els f$om ai$ to lass& D. ma=i ma=imu mum m anl anlee of in%id in%iden en%e %e +efo +efo$e $e total total inte$nal inte$nal $efle%tion $efle%tion o%%u$s en lit t$a;els t$a;els f$om ai$ to lass. >. Wi% Wi% lit lit $a8 e=i e=i+it +itss total total inte$na inte$nall $efle%t $efle%tion ion
9. 10. 11. 11. f te %$iti%a %$iti%all anle of a diamond diamond is 23 o& at is te $ef$a%ti;e inde= of diamond A. 2.12 2.3< B. C. 2.> D. 2.6 12. 13. Wi% Wi% of te follo folloin in is a penome penomenon non tat %auses mi$ae $ef$a%tion A. $ef$a%tion and total inte$nal $efle%tion B. C. $efle%tion total inte$nal $efle%tion D. 1. 1. Te dia$a dia$am m sos a lit lit $a8 ente$in ente$in a lass lass and $ef$a%ted.
16. 1<. Wat is is t te $e $ef$a%ti;e in inde= of of t te lass +lo%k A. 1.0 B. 1.> C. 1.66 1.<2 D.
2
1>. Te dia$am +elo sos a $a8& X & di$e%ted into a lass +lo%k. Te %$iti%al anle of te lass +lo%k is 2o. n i% di$e%tion does te lit mo;e f$om point Y
3. 36. 3<. D 3>. B 39. 0. 1. 2. 3. . . 6. <. Te dia$am +elo sos a lit $a8 t$a;elin t$ou an opti%al fi+$e. Te fi+$e opti% as a
ρ P lass %o$e& P & of densit8
ρ Q
19. 20. 21. Wi% of te folloin p$o%esses is not $elated to total inte$nal $efle%tion A. it is t$a;ellin f$om a dense$ to a less dense medium. n%ident anle ? %$iti%al anle. B. C. n%ident anle @ anle of total inte$nal $efle%tion $a8. D. ntensit8 of total inte$nal $efle%tion $a8 ? in%ident $a8. 22. 23. 7 lit $a8 t$a;els f$om ai$ to lass +lo%k at an in%ident anle of θ is son in dia$am +elo.
and a lass
%laddin Q of densit8
>. 9. 0.
.
Wi% of te folloin is %o$$e%t
ρ P
ρ Q
@
A.
ρ P
ρ Q
?
B.
ρ P
ρ Q
C. A 1. 2. n dia$am +elo& PQ is a lit $a8 i% t$a;els f$om te lass toa$ds te lassBai$ su$fa%e. Te anle of in%iden%e is 9 o.
2. 2. 26.
Wi% of te folloin anles A& B& C and D $ep$esents te %$iti%al anle
2<. 2>. Wi% of te folloin sos te total inte$nal $efle%tion penomenon 29. 30. 31. 32. 33. 3.
3. . .
)i;en te %$iti%al anle of te lass is 2 & te pat of te lit $a8 afte$ passin t$ou Q is QK QZL o
A. B.
3
C. QZM D. QZN 6. Wi% of te folloin statements a+out te fo$mation of mi$ae is false A. i$ae is %aused +8 total inte$nal $efle%tion. B. Te ai$ %lose to te $ound is dense$ tan te ai$ ie$ up. Te ai$ %lose to te $ound is opti%all8 less C. dense tan te ai$ ie$ up. D. #a8s of lit f$om te sk8 a$e $ef$a%ted aa8 f$om no$mal as te8 pass into te ai$ %lose to te $ound. <. >. 5pti%al fi+$es a$e used in all of te folloin e=%ept A. Teles%opes B. ndos%opes
C. Telepone %a+les D. Ca+le linkin %ompute$s 9. 60. n a %e$tain $eion& ai$ +e%omes otte$ as it ets nea$e$ to te su$fa%e of te ea$t. Wi% of te folloin sket%es +est illust$ates te pat of a lit $a8 t$a;elin f$om te sk8 to te su$fa%e of ea$t 61. A. C. C. 62. 63. 6. 6. 66. B. D. 6<. 6>. 69. <0.
71. 72. Structured Questions <3. 1. Dia$am +elo sos t$ee lit $a8s f$om a point t$a;elin in a lass +lo%k toa$ds a lassBtoBai$ +ounda$8 of te lass +lo%k in diffe$ent di$e%tions. Te $ef$a%ti;e inde= of te lass +lo%k is 1..
<. <. (a (i Cal%ulate te ;alue of anle θ . <6. <<. (ii Name te lit penomenon tat o%%u$s at X . <>.
2. Dia$am +elo sos a d$i;e$ unde$ a ot sun& sees a pool of ate$ appea$in on te $oad su$fa%e.
><. >>. (a (i Compa$e te densit8 of te %ool ai$ to te densit8 of ot ai$. >9. 90. (ii Wat appens to te di$e%tion of te $ef$a%ted $a8s en lit $a8s p$opaates f$om %ool ai$ to ot ai$ 91. (+ (i Name tis natu$al penomenon. 92. 93. (ii *tate te p8si%s %on%ept tat is in;ol;ed in tis penomenon. 9. (% sin te a+o;e dia$am& e=plain o te %a$ d$i;e$ %an see te pool of ate$. 9. (d Name te opti%al inst$ument tat uses te p8si%s %on%ept in +(ii. 96. 3.
9<. 9>. Dia$am (I 99. 100. Dia$am (I sos te a$$anement of to identi%al lass p$isms to fo$m a +ino%ula$s. Te %$iti%al anle of te lass p$ism is 2o. (a n Dia$am (I& (i %omplete te pat of lit $a8 passin t$ou te to p$isms and finall8 toa$ds te o+se$;e$. (ii it te elp of a suita+le line& d$a at te $it pla%e te imae as seen +8 te o+se$;e$. 101. (+ *tate to %a$a%te$isti%s of te imae fo$med +8 te +ino%ula$s. 102. (% =plain 8 te imae fo$med +8 te +ino%ula$s appea$s to +e enla$ed. 103. (d *tate to ad;antaes of +ino%ula$s as %ompa$ed to teles%opes.
10. 10.
Dia$am (II
106. 10<. Dia$am (II sos te +asi% ope$ation of an opti%al fi+$e e$e+8 a tin +eam of lase$ is a+le to pass t$ou it at i speed and it ;e$8 little sinal loss. 10>. (e *tate te p$in%iple used to p$e;ent sinal loss in te opti%al fi+$e. 109. (f Wat a$e te spe%ial p$ope$ties of te fi+$e mate$ial in $elation to its use 110. ( *tate t$ee ad;antaes of usin opti%al fi+$es in te field of tele%ommuni%ations. 111. .
