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1/f = 1/so - 1/si
= 1/25 - 1/50
= 2/50 - 1/50
= 1/50
f = 50 cm
P = 100/f = 100/50 = 2 dioptri (f dalam satuan cm)
b. 40 cm
1/f = 1/so - 1/si
= 1/40 - 1/50
= 1/200
f = 200 cm
P = 100/f = 100/200 = 0,5 dioptri atau 1/2 dioptri (f dalam satuan cm)