State Abbe's condition for the least distance between two objects so that they are just resolved [when they are viewed through a microscope].

Explanation

When two point objects illuminated by the same source are viewed through a microscope, the least separation between the objects surch that they are just resolved, according to Abbe, is
`d_(min)=(lamda)/(2nsini_(max))`
Where `lamda` is the wavelength of light, n is the refractive index of the medium between the objects and the objective lens, `2i_(max)` is the angle of maximum cone of light incident on the lens. The product n sin `i_(max)` is a characteristic of a given objective lens and is called the numerical aperture, `d_(min)` is called the limit of resolution.