The lateral magnification of the lens with an object located at two different position `u_(1)` and `u_(2)` are `m_(1)` and `m_(2)` , respectively. Then the focal length of the lens is

The magnifications produced by a convex lens for two different positions of an object are m_(1) and m_(2) respectively (m_(1) gt m_(2)) . If 'd' is the distance of separation between the two positions of the object then the focal length of the lens is

In the displacement method a conves lens is placed in between an object and a screen. If the magnificaiton in the two position are m_(1) and m_(2) ( m_(1) gt m_(2) ), and the distance between the two positions of the lens is x, the focal length of the lens is

When an object is at a distance u_(1)andu_(2) from a lens, real image and a virtual image is formed respectively having same magnification. The focal length of the lens is

When the object is at distance u_(1) and u_(2) the images formed by the same lens are real and virtual respectively and of the same size.Then focal length of the lens is:

When the object is at distance u_(1) and u_(2) the images formed by the same lens are real and virtual respectively and of the same size.Then focal length of the lens is:

The molecular velocities of two gases at same temperature are u_(1) and u_(2) , their masses are m_(1) and m_(2) respectively, which of the following expression is correct ?

The molecular velocities of two gases at same temperature are u_(1) and u_(2) , their masses are m_(1) and m_(2) respectively, which of the following expression is correct ?