no 4 gimana...............

Dik:
S = 10 cm
R = -40 cm
h = 8 cm

Dit h'__?
f = R/2
f = -40/2
f = -20 cm

h' = h × f/s - f
h' = 8 × -20 / 10 - (-20)
h' = -160 / 30
h' = -16/3 cm ≈ 5,33 cm ← tinggi bayangan

M = h'/h
M = (-16/3)/8
M = -16/8× 3
M = -16/24
M = -2/3 kali ≈ 0,66 kali ← Perbesaran