What is the focal length of the diverging lens

Reference no: EM13252132

A converging lens has 31.3 cm focal length, and is placed 20.9 cm behind a diverging lens. Parallel light strikes the diverging lens. After passing through the converging lens, the light is again parallel. What is the focal length of the diverging lens in cm? (Hint: draw a ray diagram)

Reference no: EM13252132

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