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A person looks at a gem using a converging lens with a focal length of 15.0 cm. The lens forms a virtual image 26.0 cm from the lens. Determine the magnification.

(1/p)+(1/q) = (1/f)

p=?

q=26 cm

f=15 cm

(1/15)-(1/26)= Ans^-1 = 35.5 cm (p)

Magnification= -(q/p)

M= -(26/35.5)

M= -0.733

Answer [-.733] has been marked wrong. What did I do?