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Two concave lenses of 60 cm focal length are cemented on either side of a convex lens of 15 cm focal length. The focal length of the combination is

The focal length of a converging lens is 15 cm. An object is placed 45 cm away from the lens. The image will be

In a telescope the object glass of focal length 14 cm, is located at 20 cm from the diaphragm. The focussing lens is midway between them when a staff 16.50 m away is focussed. The focal length of the

A convex lens has a focal length of 30 cm. Calculate at what distance should the object be placed from the lens so that it forms an image at 60 cm on the other side of the lens

For a converging lens focal length is

A concave mirror and a convex lens both have same focal length in air. When they are submerged in glycerine, the focal length

A thin concave and a thin convex lens are in contact. The ratio of the magnitude of power of two lenses is 2/3 and focal length of combination is 30cm, then the focal length of individual lenses are

The focal length and power of the combination of convex and concave lens of same focal lenght placed in contact with each other

A convex lens of focal length 8 cm is to be used to form a virtual image 2 times size of object. Where must lens be placed

Relation between object and image distance from lens in terms of focal length of lens is called