A diverging lens of focal length 20 cm and a converging lens


A diverging lens of focal length $20 \mathrm{~cm}$ and a converging lens of focal length $30 \mathrm{~cm}$ are placed $15 \mathrm{~cm}$ apart with their principal axes coinciding. Where should an object be placed on the principal axis so that its image is formed at infinity?


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