Page 128 - MUDAH DAN AKTIF BELAJAR FISIKA SMA KELAS X

,531A1 D=D= :9;1 3181H1 25A75A1; 41A9 =549D= ;5 =549D=
medium air
9>45;B 291B =549D= A5<1C96 C5A8141@ =549D= ,531A1 =1C5=1C9B 41@1C (medium–1)
49CD<9B;1> B521719 25A9;DC
+ +
+ medium kaca
(medium–2)
+ + B9> &
+ B9> .
)5AB1=11> C5AB52DC 41@1C :D71 49CD<9B B521719 25A9;DC Gambar 6.20
Sinar yang melalui dua medium
+ B9> & berbeda, yaitu air dan kaca.
+ + B9> . L

$5C5A1>71>
+ 9>45;B 291B =DC<1; =549D=
+ 9>45;B 291B =DC<1; =549D=
+ 9>45;B 291B =549D= A5<1C96 C5A8141@ =549D=
& BD4DC 41C1>7 49 =549D=
. BD4DC 291B 49 =549D=

3. Hubungan Cepat Rambat Cahaya dan Indeks Bias Medium
)5A81C9;1> $0%$4 &9B1<>H1 BD1CD 75<?=21>7 2941>7 )*
49<5F1C;1> =5<1<D9 =549D= ;5 =549D= H1>7 <5298 A1@1C ,5C5<18 F1;CD Q
0 75<?=21>7 2941>7 )* 25A141 @141 2941>7 ,+ ) 1
20 20
medium 1 P 1
medium 2 2 R
20 2 0 )
2
S
2
2 Gambar 6.21
Pembiasan cahaya melalui dua
L medium

9;5C18D9 2 # 45>71> # 6A5;D5>B9 41> @1>:1>7 75<?=21>7
5>71> 45=9;91> >9<19 9>45;B 291B 41@1C 49@5A?<58 :D71 41A9 @1>:1>7
75<?=21>7

n 2 L
12

1
(45$0$$1 ; 41> 3(45$0$$1 ; =5=9<9;9 =1;>1 69B9B H19CD
;535@1C1> 3181H1 41<1= BD1CD =549D= 25A21>49>7 C5A21<9; 45>71> >9<19
9>45;B 291B>H1 &1;BD4>H1 :9;1 9>45;B 291B B5=1;9> 25B1A ;535@1C1>
3181H1 B5=1;9> ;539< ,521719 3?>C?8 ;535@1C1> 3181H1 41<1= =549D=
;131 <5298 ;539< 4921>49>7;1> 45>71> ;535@1C1> 3181H1 ;5C9;1 =5A1=21C
41<1= 19A <1B1>>H1 9>45;B 291B =DC<1; ;131 <5298 25B1A 41A9@141 9>45;B
=DC<1; 19A ,5<19> 9CD >41 :D71 41@1C =5>H9=@D<;1> 218F1 ;5C9;1
75<?=21>7 =5A1=21C 41A9 BD1CD =549D= ;5 =549D= <19> H1>7 9>45;B
291B>H1 25A2541 @1>:1>7 75<?=21>7 41> 25B1A ;535@1C1> 2 75<?=21>7
C5AB52DC 25AD218 >1=D> 6A5;D5>B9 # 75<?=21>7 C5AB52DC C941; 25AD218

Cahaya dan Optika 119