Distance of an object from the first focus of an equiconvex lens is 10 cm and the distance of its reimage from second focus is 40 cm. The focal length the lens is

Distance of an object from the first focus of an equi-convex lens is 10 cm and the distance of its real image from second focus is 40 cm. The focal length of the lens is

Distance of an object from the first focus of an equi-convex lens is 10 cm and the distance of its real image from second focus is 40 cm. The focal length of the lens is

An object is kept at a distance of 4 cm form the first focus of a convex lens. A real image is formed at a distance of 9 cm from its second focus. What is the focal length of that lens is ___________(in cm)

An object placed at a distance of a 9cm from the first principal focus of a convex lens produces a real image at a distance of 25cm. from its second principal focus. then the focal length of the lens is :

An object is placed at a distance u from an equiconvex lens such that the distannce between the object and its real image is minimum. The focal length of the lens is f. The value of u is

An object is placed at a distance u from an equiconvex lens such that the distannce between the object and its real image is minimum. The focal length of the lens is f. The value of u is

An object is placed at a distance x_1 from the principal focus of a lens and its real image is formed at a distance x_2 from the another principal focus. The focal length of the lens is