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F= V/Lambda
= 3000/7500
= 0,4
Periode : 1/F
: 1/0,4
; 2,5
2. So = 20
Sn = 30 (umumnya pandang normal menggunakan 30/25 cm)
1/F = 1/So + 1/Sn
= 1/20 + 1/30
= 3/60 + 2/60
1/F = 5/60
F = 60/5 (dibalik)
F = 12 cm. insyaAllah bener
T = V : λ
T = 30 : 7,5 ------>>>>> ( 30 berasal dari penyamaan satuan ke SI )
T = 4 s
2. P = 100/25 + 1/-PP
= 100/25 + 1/-20
= 400/100 - 5/100
= 395 / 100 = 3,95 = 4 dioptri
P = 1/f
f = 1/P
f = 1/4