At the centre of a 4 cm axial rod, a concave mirror has |m|=2. If one estimates image length using infinitesimal longitudinal magnification, the estimated image length is:
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Question

At the centre of a 4 cm axial rod, a concave mirror has |m|=2. If one estimates image length using infinitesimal longitudinal magnification, the estimated image length is:

G1 Physics · Accepted Answer

Longitudinal magnification≈|m|²=4, so 4 cm becomes approximately 16 cm.