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Dit? R?
Dijawab : P = 100/f
2,5 = 100/f
f = 100/2,5
= 40 cm
Dijawab : R = 2f
= 2.40
= 80 cm
P = +2,5D
Ditanyakan : R ?
Dijawab :
P = 100/f
f = 100/P
= 100/2,5
= 40 cm
Jadi jari" lensa =
R = 2 f
= 2 x 40
= 80 cm