A concave mirror forms a real image whose area is 9 times the object area. If |f|=18 cm, the object-image separation is:
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A concave mirror forms a real image whose area is 9 times the object area. If |f|=18 cm, the object-image separation is:

G1 Physics · Accepted Answer

Area ratio 9 gives M=3. Then u=24 cm and v=72 cm, so separation=48 cm.