Ray Optics Test...

A telescope has an objective lens of focal length 200 cm and an eye piece with focal length 2 cm. If this telescope is used to see a 50 meter tall building at a distance of 2 km, what is the height of the image of the building formed by the objective lens?

If F₀ and F_e are the focal length of the objective and eyepiece respectively of a telescope, then its magnifying power will be

An astronomical telescope has objective and eyepiece lens of powers 0.5 D and 20 D respectively, its magnifying power will be

The diameter of the objective of the telescope is 0.1 metre and wavelength of light is 6000 Å. Its resolving power would be approximately

A photograph of the moon was taken with telescope. Later on, it was found that a housefly was sitting on the objective lens of the telescope. In photograph

For a telescope to have large resolving power the

The resolving power of an astronomical telescope is 0.2 seconds. If the central half portion of the objective lens is covered, the resolving power will be

The angular resolution of a 10 cm diameter telescope at a wavelength of 5000 Å is of the order

For a compound microscope, the focal lengths of object lens and eye lens are f₀ and f_e respectively, then magnification will be done by microscope when

To increase the magnifying power of telescope (f₀ = focal length of the objective and f_e = focal length of the eye lens)