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1/f = 1/25 - 1/40 (karena bayangan maya maka bertanda -)
1/f = (8-5)/200
1/f = 3/200
f = 200/3 cm = 200/3 * 1/100 = 2/3 m
P = 1/f = 1/ (2/3) = 3/2 = 1,5 dioptri