[" In a travelling microscope,focal length of "],[" objective is "]

The focal length of the objective of a microscope is

The focal length of the objective of a microscope is-

In compound microscope, length of microscope is 21.5 cm, focal length of objective is 1.6 cm, focal length of eye piece is 2.1 cm and if final image is formed at infinity then distance of the object from objective lens is

In compound microscope, the focal length and aperture of the objective used is respectively