A convex lens 'A' of focal length 20 cm and a concave lens 'B' of focal length 5 cm are kept along the same axis with a distance ' d ' between them. If a parallel beam of light falling on 'A' leaves 'B' as a parallel beam, then the distance ' d ' in cm will be

1. A. 15
2. B. 50
3. C. 30
4. D. 25

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