A convex lens of focal length 30 cm produces 5 times magnified real image of an object. What is the object distance?

A convex lens of focal lengths 30 cm produces 5 times magnified real image of an object What is the object distance ?

A convex lens of focal length f will form a magnified real image of an object if the object is placed

A convex lens of focal length f produces a real image 3 times as that of size of the object, the distance between the object and the lens is

A convex lens of focal length f produces a real image 3 times as that of size of the object, the distance between the object and the lens is

A convex lens of focal length f produces a virtual image n times the size of the object. Then the distance of the object from the lens is