Astronomical Telescope

Correct the following sentence:

The distance between objective and eye-piece of an astronomical telescope for normal vision setting is $\left(f_o+f_e\right)/2$.

Correct the following sentence:

The objective of telescope has small aperture.

An astronomical telescope uses two lenses of powers $10 \mathrm{D}$ and $1 \mathrm{D}$. What is magnifying power in normal adjustment?

A telescope has an objective of focal length $50 \mathrm{cm}$ and an eye-piece of focal length $5 \mathrm{cm}$. The least distance of distinct vision is $25 \mathrm{cm}$. The telescope is focussed for distinct vision on a scale $200 \mathrm{cm}$ away from the object. Calculate the separation of the objective and the eye-piece.

A telescope tube $80 \mathrm{cm}$ long provides a magnification of $19$. Calculate the focal length of the objective and eyepiece.

With a neat ray diagram, describe the principle, working and use of an astronomical telescope.

What is mean by the normal setting of an astronomical telescope? How its magnifying power differs when it is set with the final image at the near point?

A telescope has an objective of focal length $50 \mathrm{cm}$ and an eyepiece of focal length $5 \mathrm{cm}$. It is focussed for distinct vision on a scale $200 \mathrm{cm}$ away from the objective. Then the optical length of the telescope is (Take least distance of distinct vision to be $25 \mathrm{cm}$)

The length of a simple astronomical telescope is

You are supplied with four convex lenses of focal lengths $100 \mathrm{cm}, 25 \mathrm{cm}, 3 \mathrm{cm}$ and $2 \mathrm{cm}$. For designing an astronomical telescope, you will use lenses of focal lengths

What is the function of the objective lens in an astronomical telescope? Why should it have a long focal length and a large aperture?

Draw a ray diagram to show the image formation in a refracting type astronomical telescope in the near point adjustment.

Astronomers prefer to use the telescope with a large objective diameter to observe astronomical objects. Explain why?

What is the distance between the objective and eyepiece of an astronomical telescope for normal vision-setting?

Why eyepiece of a small aperture is taken?

Why objective of a large aperture is taken in a telescope?

For a telescope, in which case the magnifying power is maximum: Normal adjustment or Near point adjustment.

The magnifying power of an astronomical telescope is $8$ and the distance between two lenses is $54\mathrm{cm}$. What is the focal length of the eye lens and objective?

The length of a telescope is $100\mathrm{cm}$ and magnification is $18$. The focal lengths of the objective and eye lens are nearly

For an astronomical telescope used in normal adjustment, objective and the eyepiece are separated by a distance of $55 \mathrm{cm}$. If the magnifying power of the telescope is $10$, the power of objective is