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diketahui =
PR = 2m = 200cm
P =......?
P = -100/PR
P = -100/200
P = -0,5 dioptri
Si = 2m = 200 cm
dita : f .....?
jawab :
1/f = 1/So + 1/Si
= 1/25 + 1/200
= 8/200 + 1/200
= 9/200
= 0.045 D