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1/s = 1/f - 1/s'
= 1/15 - 1/10
= 2/30 - 3/30
= -1/30
= 30/-1 = -30
Perbesaran bayangan
M = f/(s-f)
= 15/(-30-15)
= 15/(-45)
= -0,33
Maaf ya kalau salah