In a travelling microscope, focal length of objective 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

For a compound microscope, the focal length of object lens and eye lens are f_(o) and f_(e) respectively, then magnification will be done by microscope when

Consider the following statements about a microscope and a telescope 1. Both the eyepiece and the objective of a microscope are convex lenses. 2. The focal length of the objective of a telescope is lerger than the focal length of its eyepiece. 3. The magnification of a telescope increases with the increases in focal length of its objective. 4. The magnification of a microscope increases with the increases in focal length of its objective. Which of the statements given above are correct?

Relative difference of focal lengths of objective and eye lens in the microscope and telescope is given as

Relative difference of focal lengths of objective and eye lens in the microscope and telescope is given as