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You are giving 3 lenses L1, L2 ,L3 each of focal length 15 cm. An object i

You are giving 3 lenses L1, L2 ,L3 each of focal length 15 cm. An object is kept at 20 cm in front of L1. The final real image I is formed at the focus of L3. Find the separation between L1 and L2.

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