The ratio of the focal length of the obuective to the focal
length of the eyepiece is greater than one for

The magnifying power of a telescope is 10. What would be its new magnifying power if the focal length of the objective is doubled and the focal length of the eyepiece is halved ?

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?

In an astronomical telescope , the focal length and the aperture of the objective are …… and the focal length and the aperture of the eyepiece are taken …… as compared to those of the objective [fill in the blank].

Length of a Galilean telescope in normal adjustment, in terms of the focal lengths of the objective (f_o) and that of the eyepiece (f_e) is