Physics, asked by surajitmaity9475, 1 month ago

A concave lens of focal length 20 cm and double convex lens of focal length 30 cm are placed 15 cm apart on their common axis. If an object is placed at distance x in front of concave lens then value of x so that image is formed at infinity is (1) 21 cm (2) 60 cm (3) 30 cm (4) 50 cm

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Answered by rajeenasalim379

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4) 50centimeter

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