Mohon di bantu nomor 13 yah...

M = -s'/s
2 = -s'/s
s' = -2s
s' = -2.25
s' = -50

1/s + 1/s' = 1/f
1/25 - 1/50 = 1/f
2/50 - 1/50 = 1/f
1/50 = 1/f
f = 50 cm

P = 100/f
P = 100/50
P = +2 dioptri

Jawaban: A