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R=30 cm
f=R/2
f=30/2=15 cm
1/f = 1/s + 1/s'
1/15=1/10 + 1/s'
1/s'=1/15 - 1/10
s' = (15 x 10) / (10 -15)
s' = - 30 cm
pada cermin cekung negatif artinya dibelakang cermin maya tegak
M=s'/s
M=-30/10= 3 kali
artinya diperbesar
jadi sifat bayangan yang terjadi maya, tegak,di belakang cermin, diperbesar