Two identical thin converging lenses are kept in contact at a distance 12.5 cm from an object. If image produced is 4 times enlarged then what is the optical power of each lens.
`[5D]`

Two identical thin converging lenses brought in contact so that their axes coincides are placed 12.5cm form an object. What is the optical power of the system and each lens, if the real image formed by the system of lenses if four times as large as the object?

Two identical thin converging lenses brought in contact so that their axes coincides are placed 12.5cm form an object. What is the optical power of the system and each lens, if the real image formed by the system of lenses if four times as large as the object?

Ten identical converging thin lenses,each of focal length 10cm are in contact .What is the power of the combined lens.

Two coaxial thin lenses are placed in contact with each other and a small object is placed at a distance of 20cm from the combination of lenses. The focal length of each lens is 30 cm. What will be the distance between the object and the image when both the lenses are (i) convex (ii) concave

An object is kept at a distance of 16 cm from a thin lens and the image formed is real. If the object is kept at a distance of 6 cm from the lens, the image formed is virtual. If the sizes of the images formed are equal, the focal length of the lens will be

An object is kept at a distance of 16 cm from a thin lens and the image formed is real. If the object is kept at a distance of 6 cm from the lens, the image formed is virtual. If the sizes of the images formed are equal, the focal length of the lens will be

An object is kept at a distance of 16 cm from a thin lens and the image formed is real. If the object is kept at a distance of 6 cm from the lens, the image formed is virtual. If the sizes of the images formed are equal, the focal length of the lens will be