Telescope Questions

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

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

Assertion: The resolving power of a telescope is more if the diameter of the objective lens is more.Reason: Objective lens of large diameter collects more light.

The magnifying power of a telescope is $9$. When it is adjusted for parallel rays the distance between the objective and eyepiece is $20\text{cm}$. The focal length of lenses are:

In an astronomical telescope in normal adjustment, a straight black line of the length $L$ is drawn on the objective lens. The eye-piece forms a real image of this line. The length of this image is $I$. The magnification of the telescope is:

An astronomical telescope has objective and eyepiece of focal lengths $40\text{cm}$ and $4\text{cm}$ respectively. To view an object $200\text{cm}$ away from the objective, the lenses must be separated by a distance: