A 31cm focal length converging lens is 21cm behind a


A 31cm focal length converging lens is 21cm behind a diverginglens. Parallel light stikes the diverging lens. After passing through the converging lens, the light is againparallel. What is the focal length of the diverging lens? (hint: first draw a ray diagram)

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Physics: A 31cm focal length converging lens is 21cm behind a
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