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A concave lens of focal length 20cm and double convex lens of focal length 30cm are placed 15cm 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

Answer» A concave lens of focal length 20cm and double convex lens of focal length 30cm are placed 15cm 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


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