A 3 cm high object is placed 30 cm in front of a concave mirror of focal length 20 cm. Which set gives the image distance and image height?
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A 3 cm high object is placed 30 cm in front of a concave mirror of focal length 20 cm. Which set gives the image distance and image height?

G1 Physics · Accepted Answer

Using 1/f=1/v+1/u with magnitudes for this real-object case: 1/20=1/30+1/v, so v=60 cm. Transverse magnification m=−v/u=−2, hence hᵢ=−6 cm.