A convex lens of power +6d is placed in contact with concave lens of power -4d. what will be the nature and focal length of the combination ?
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A convex lens of power +6d is placed in contact with concave lens of power -4d. what will be the nature and focal length of the combination ? A convex lens of power +6d is placed in contact with concave lens of power -4d. what will be the nature and focal length of the combination [...]