Converging lens-what is the focal length of the lens

Reference no: EM13645871

When an object is placed 60 cm from a converging lens, it forms areal image. When the object is moved to 40 cm from the lens, the image moves 10 cm farther from the lens. What is the focal length of the lens?
A) 20 cm
B) 30 cm
C) 40 cm
D) 42 cm

Reference no: EM13645871

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