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7/23/2019 Laporan Praktikum FISTER O1.doc
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LAPORAN PRAKTIKUM FISIKA TERAPAN
MENENTUKAN TITIK API & KEKUATAN LENSA
(PERCOBAAN O1)
NAMA PRAKTIKAN :
1. SAMSU ADI NUGROHO NIM 21010115060021
2. FARAH ALYA ANGHISTRA NIM 21010115060022
3. ANINDYA CAHYAWATI NIM 210110115060023
PROGRAM DIPLOMA III TEKNIK SIPIL
UNIVERSITAS DIPOPNEGORO
SEMARANG
2015
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MENENTUKAN TITIK API DAN KEKUATAN LENSA
- PERCOBAAN O1 -
I. MAKSUD PERCOBAAN
Menentukan ttk a! "an kekuatan #en$a
II. ALAT YANG DIBUTUKAN
1. La%!u
2. &en''a($
3. Len$a !)$t* "an #en$a ne'at*
+. La,a(
5. -an'ku )!tk
III. CARA MELAKUKAN PERCOBAAN
A. Menentukan ttk a! #en$a !)$t*
1. Mu#a%u#a /en"a #en$a !)$t* "an #a,a( untuk %enan'ka! /a,an'an
"!)()$kan. A(tn,a /en"a !u$at #en$a "an /en"a !u$at #a,a( /e(a"a
!a"a 'a($ #u(u$ ,an' $eaa( "en'an /an'ku )!tk.
2. Letakkan /en"a %au!un /a,an'an#a,a( !a"a /an'ku )!tk "'n te!at.
3. Len$a "#etakkan "anta(a /en"a "an #a,a( "'e$e('e$e( $a%!a
te("a!at /a,an'an ,an' !a#n' te(an' !a"a #a,a(.
+. Sete#a "ketau ke"u"ukan n #en$a "'e$e( ke kanan $e"kt
$a%!a /a,an'an %ena" ka/u(. 4e%u"an #en$a "'e$e( !e#an!e#an
"a( a(a ke kanan ke k( $a%!a te("a!at /a,an'an ,an' te(an' #a'
a(ak /en"a "an /a,an'an "uku( "en'an !en''a($
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5. Len$a ke%u"an "'e$e( ke k( $a%!a /a,an'an !a"a #a,a( %ena"
ka/u( ke%u"an "'e$e( "a( a(a k( kekanan !e(#aan#aan
$a%!a te("a!at /a,an'an ,an' !a#n' te(an'. a(ak /en"a "an
/a,an'an n "na%akan a(ak /en"a "a( k( "an a(ak /en"a "an
/a,an'an !a"a n) + "na%akan %a$n'%a$n' a(ak /en"a "a(
kanan "an /a,an'an "a( kanan.
6. a(ak /en"a %au!un /a,an'an "a%at 3 7 "a( kanan "an k(
ke%u"an "8atat.
9. Da( a('aa('a / "an : $ete#a "a%/# (ata(atan,a a(ak ttk a!
"an kekuatan #en$a "a!at "tun' "en'an %en''unakan !e($a%aan
;1< "an ;3<. Uku(#a a(ak /en"a "an /a,an'an ;ka#au a(ak n = +*<
3 ka# "an u'a a(ak "anta(a ke"u"ukan #en$a 3 7. Htun'#a a(ak
ttk a! #en$a "en'an %en''unakan !e($a%aan ;2<.
-. Menentukan ttk a! #en$a ne'at*
1. -en"a %au!un #en$a !)$t* "/uat teta! te%!atn,a.
2. 4e%u"an "8a( /a,an'an !a#n' te(an' ,an' "/uat #en$a !)$t* 3
7 "a( kanan "an k(. a(ak /a,an'an #en$a !)$t* "8atat.
3. -a,an'an /en"a !)$t* n "!aka $e/a'a /en"a %a,a /a' #en$a
ne'at* a'a( te("a!at /a,an'an ,an' n,ata. -en"a %e(u!akan /en"a
%a,a /#a #en$a ne'at* "#etakkan anta(a #en$a !)$t* "an /a,an'an
#en$a !)$t*. 4e"u"ukan #en$a !)$t* "/uat teta!.
+. La,a( ke%u"an "'e$e('e$e( $e"e%kan 3 7 "a( kanan "an k(
n''a "!e()#e /a,an'an ,an' !a#n' te(an'. a(ak anta(a #en$a
!)$t* "an ne'at* "8atat "e%kan u'a a(ak /a,an'an #en$a
ne'at*.
5. a(ak /en"a #en$a ne'at* a"a#a $e#$ a(ak /a,an'an #en$a !)$t*
"an a(ak anta(a ke"ua #en$a.
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6. Maka "a( a('aa('a / "an : "!e()#e ttk a! %au!un kekuatan
#en$a "en'an %en'n'at /a>a a('a : ne'at*.
IV. TEORI PERCOBAAN
4a#au a(ak /en"a %au!un a(ak /a,an'an !a"a !e%/entukan ,an'
!a#n' te(an' "ketau %aka a(ak ttk a! #en$a ;*< "tun' "en'an (u%u$ ?
<1;..........111
vb F +=
D%ana ? / @ a(ak /a,an'an ,atu a(ak "a( !u$at #en$a ke /a,an'an
: @ a(ak /en"a ,atu a(ak "a( /en"a ke !u$at #en$a
ka /en"a "an /a,an'an "a#a% a(ak k)n$tant ,an' #e/ /e$a( "a( +7
a(ak ttk a! #en$a. A"a 2 ke"u"ukan #en$a ,an' %un'kn "anta(a
/en"a "an /a,an'an ,an' %en'a$#kan /a,an'an/a,an'an ,an' !a#n'
te(an' /a,an'an ,an' $atu %e(u!akan /a,an'an ,an' "!e(/e$a( "an
,an' #an /a,an'an "!e(ke8#. ka " %en,atakan "anta(a /en"a "an
/a,an'an "an a(ak 8 a(ak anta(a ke"u"ukan #en$a %aka a(ak ttk a!
#en$a a"a#a
<2;..........+
22
d
cd f
−=
+
A
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Ga%/a( %ene(an'kan : " "an * !a"a #en$a ⊕ !)$t*. Ca(a #an untuk
%enentukan ttk a! #en$a "8a( %e#a#u 2 %a8a% ke"u"ukan #en$a
,an' %un'kn "anta(a /en"a "an /a,an'an te(/entuk
Da( 'a%/a( "a!at "!e()#e !e($a%aan ?
A1 @ A C @ " B A
2A @ " B 8
A @ <3;..........2
cd −
A @ A C @ " B AE
2AE @ " 8
AE @ <+;..........2
cd +
&e($a%aan 3 "an + "%a$ukkan "a#a% !e($a%aan ?
d
ca F
ca
d
F
caca F
+
+1
221
22
22
−=
−
=
++
−=
5
-
A
F
C
AE
-EAE
-E
-E
AE
CE
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Untuk #en$a ;< untuk %en"a!atkan /a,an'an $eat !a"a #a,a(
/en"a a(u$ %e(u!akan /en"a %a,a ,an' "!e()#e "en'an !e(t)#)n'an
#en$a ;< ,atu /a,an'an $eat ,an' "/entuk )#e #en$a ;< akan
%ena" /en"a %a,a untuk #en$a ;<. 4ekuatan #en$a "a!at "n,atakan
"en'an ")!t( ?
<5;..........1
f P =
"%ana * "n,atakan "a#a% %ete(
V. ASIL PERCOBAAN
A. a(ak ttk a! "an kekuatan #en$a !)$t*
a(ak /en"a a(ak -a,an'an
Da( kanan Da( k( Rata(ata Rata(ata
ak(
Da( kanan Da( k( Rata(ata Rata(ata ak(
1
5
6
+
95
5
69
612
61
61+
62
615
61+
616
6125
6115
6123
a(ak /en"a "a( /en"a /a,an'an a(ak ke"ua ke"u"ukan #en$a160 8% 3910 8%
Dtun' "a#a% 8%
-. a(ak ttk a! "an kekuatan #en$a !)$t*
a(ak /a,an'an #en$a !)$t* a(ak #en$a
;< ke ;<
a(ak /a,an'an #en$a ne'at:e
Da( kanan Da( k( Rata
(ata
Rata(ata
ak(
ke Da( kanan Da( k( Rata
(ata
Rata(ata
ak(
612
61
60
62
615
61+
616
6125
6115
6133 5+
1160
1190
1150
1130
1120
1110
11+5
11+5
1130
11+0
Dtun' "a#a% 8%
VI. PERITUNGAN
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1. a. Menghitung titik api (f) dengan rumus lensa (positif) :
<1;...........
111
vb
vb
vb f
+=+=
D%ana : @ a(ak /en"a ,atu a(ak /en"a ke #en$a.
/ @ a(ak /a,an'an ,atu a(ak /a,an'an ke #en$a
"a%/# (ata(ata "a( 3 7 !e(8)/aan
&e(8)/aan ;1<. Dket ? : @ +8% / @ 6160 8%
Dta ? a. *)ku$ . . . . .
/. kekuatan #en$a . . . . .
a>a/ ?
a. cmvb
vb
vb f 026+0
++6061
160
+FG6061
+FG6061
.
111==
⋅
+=
+=+=
%aka
mcm f 39G9F0G9F39026+0
1===
/.6+02
39G9F0
11===
f p
")!t(
&e(8)/aan ;2<. Dket ? : @ 95 8% / @ 6125 8%
Dta ? a. *)ku$ . . . . .
/. kekuatan #en$a . . . . .
a>a/ ?
a.
cm
vb
vb
vb f
026+50
++60+G
160
95FG.2561
95FG2561
.
111==
+=
+=+=
%aka ?
mcm f 39G0920G09239026+50
1===
9
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/. dioptri f
P 6+50239G0920
11===
&e(8)/aan ;3<. Dket ? : @ 5 8% / @61158%
Dta ? a. *)ku$ . . . . .
/. kekuatan #en$a . . . . .
a>a/ ?
a.
cm
vb
vb
vb f
026+900
6G60++
160
G5FG.1561
G5FG1561
.
111==
+=
+=+=
%aka ?
mcm f 3999G6099G639026+900
1===
/. dioptri f
P 6+9023999G60
11===
1. b. Menghitung titik api (f) dengan rumus ( pada lensa positif) :
<2....;..........+
22
d cd f −=
4ete(an'an ? " @ a(ak /en"a ke /a,an'an
8 @ a(ak ke"u"ukan anta(a ke"ua #en$a
Dket ? " @ 160 8% 8 @ 3910 8%
Dta ? a. *)ku$ . . . . .
/. kekuatan #en$a . . . . .
a>a/ ?
a.<160.;+
<1039;<160;
+
2222−
=−
=
d
cd f
mcm 39G+G0G+G396+0
2+223===
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/. dioptri f
P 6+22239G+G0
11===
1. c. Ralat Fokus Positif
Da( %en'tun' *)ku$ #en$a !)$t* "en'an (u%u$ ?
N) a(ak ttk a! ;%< Se#$ "en'an (ata(ata &en,%!an'an
1
2
3
0399
03909
03999
00005
00001+
0.000+3
00005
00001+
0000+3
03921 00000033 00003
Ra#at n$/ @ J100+90J10039G210
0003G0= x
4e$ek$a%aan @ ;100 B 0100+9< J @ J
F)ku$ @ ;03921 00003<
1. d. Ralat Kekuatan Lensa Positif
Da( %en'tun' *)ku$ #en$a !)$t* "en'an (u%u$ ?
N) 4ekuatan #en$a ;< Se#$ "en'an (ata(ata &en,%!an'an
1
2
3
26+0
26+5
26+9
000+
0001
0003
000+
0001
0003
26++ 0 00029
Ra#at n$/ @ 1020J1006++2
00290= x J
4e$ek$a%aan @ ;100 B 0102< J @ J
F)ku$ @ ;26++ 00029<
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. a. Menghitung titik api (f) dengan rumus (negatif)
<1;...........
11
vb
vb
vb f
+
=+=
4ete(an'an ?
: @ a(ak /a,an'an #en$a !)$t*
@ a(ak /a,an'an ;< B a(ak anta(a ke"ua #en$a
/ @ a(ak /a,an'an #en$a ne'at*
&e(8)/aan ;1<. Dket ? : @ 6160 B 5+ @ 96 8% / @ 11+5 8%
Dta ? a. *)ku$ . . . . .
/. kekuatan #en$a . . . . .
a>a/ ?
a. 21F002G9
051F
69.+511
69+511
.
111==
+
=
+
=+=
vb
vb
vb f 8%
%aka ?
mcm f 0+60566+21F0
1===
/. dioptri f
P 93F210+60
11===
&e(8)/aan ;2<. Dket ? : @ 6125 B 5+ @ 925 8%
/ @ 11+5 8%
Dta ? a. *)ku$ . . . . .
/. kekuatan #en$a . . . . .
a>a/ ?
a. cmvb
vb
vb f 2250
012G3
91G
259+511
259+511
.
111==
⋅
+=
+=+=
10
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%aka ?
mcm f 0++0++++
2250
1===
/. dioptri f
P 929220++0
11===
&e(8)/aan ;3<. Dket ? : @ 6115 B 5+ @ 915 8%
/ @ 1130 8%
Dta ? a. *)ku$ . . . . .
/. kekuatan #en$a . . . . .
a>a/ ?
a. cmvb
vb
vb f 22G0
9F5G0
+51G
159.3011
1593011
.
111==
+=
+=+=
%aka ?
mcm f 0++03G6+22G0
1===
/. dioptri f
P 929220++0
11===
. b. Ralat fokus negatif
Da( tun'an *)ku$ #en$a ne'at* "en'an (u%u$
N) a(ak ttk a! ;%< Se#$ "en'an (ata(ata &en,%!an'an
1
2
3
00+6
00++
00++
0001
0001
0001
00001
0001
0001
00+5 000033 0001
Ra#at n$/ @ J2222J1000+50
0010= x
4e$ek$a%aan @ ;100 B 2222< J @999 J
Ha$# ak( @ ;00+5 0001< %
N) 4ekuatan Len$a ;< Se#$ &en,%!an'an
1 2193 06 06
11
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2
3
22929
22929
032
032
032
032
223 00103 0++
Ra#at n$/ @ J0052J1003FG22
++F0= x
4e$ek$a%aan @; 100 B 2005< J @ 53+ J
Ha$# ak( @ ;223 0++< %
VII. P!"#$%$$%
1. A!aka ,an' "%ak$u" "en'an #en$a "#e('ent "an 8)n:e('ent
2. A!a ,an' "%ak$u" "en'an a//e(a$ $aten$
a>a/an ?
1. Len$a 4)n:e('ent
Len$a !)$t* ,an' /e($*at %en'u%!u#kan $na( "an 8( ka$ "an
#en$a n a"a#a /a'an uun'n,a t!$ "an ten'an,a te/a# $e(ta a$#
$e#$ anta(a $e!e( a(a( !e(ta%a "an $e!e( a(a( ke"ua = 0
(u%u$
011
21
>−
R R
2. Len$a D:e('ent
Len$a ne'at* ,an' $*atn,a %en,e/a( $na( "an 8( ka$ "a( #en$an a"a#a /a'an uun'n,a te/a# $e"an' /a'an ten'an,a t!$ $e(ta
a$# $e#$ $e!e( a(a( !e(ta%a "an $e!e( a(a( ke"ua K 0
011
21
<−
R R
12
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Len$a n a"a 3 %a8a% ?
1. -k)nka*
2. &#ukanka*
3. 4)n:e$k)nka*
VIII.P!'$$*$%
&e(8)/aan n "#akukan untuk %enentukan ttk a! ;*)ku$ "an
kekuatan #en$a /ak !)$t* %au!un !a"a #en$a ne'at*. A"an,a (a#at
n$/ "an ke$ek$a%aan "$e/a/kan )#e
1. Ca(a !en'#atan /a,an'an
"a( ka/u( ke e#a$ ,an' ku(an' te!at.
2. &en'uku(an a(ak ,an' ku(an'
te#t
3. &e(a#atan ,an' "'unakan
"a#a% !(aktek O1 ,an' ku(an' %e%a"a.
I+. K!*,'/$%
1. 4a#au a(ak /en"a %au!un /a,an'an !a"a !e%/entukan /a,an'an
,an' !a#n' te(an' "ketau %aka *)ku$ "a!at "ketau.
2. 4ekuatan #en$a /e(/an"n' te(/a#k "en'an a(ak *)ku$n,a %aka
$e%akn /e$a(au a(ak ttk a!*)ku$ #en$a $e%akn ke8# kekuatan
#en$a te($e/ut. -e'tu u'a $e/a#kn,a.
3. Len$a ,an' %e%!un,a a(ak *)ku$ ke8# te(n,ata kekuatan
%en'u%!u#kan $na( #e/ /e$a(.
+. Len$a ,an' /ak /a,an'an ,an' "a$#kan /e$a(n,a a(u$ "entk
"en'an /en"an,a. Han,a $aa %un'kn "!e(/e$a( atau!un "!e(ke8#
/entukn,a $e/an'un.
13