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cermin cembung = cermin negatif
1/f = 1/s + 1/s'
1/-7 = 1/21 + 1/s'
1/s' = -1/7 - 1/21
1/s' = -3/21 - 1/21
1/s' = -4/21
s' = -21/4 cm
s' = 21/4 cm dibelakang cermin (maya)
M= s'/s = (21/4) / 21 = 1/4 = 0,25 (diperkecil)
jdi sifatnya : maya , terbalik , diperkecil