What is the length of astronomical telescope.

with the help of labelled diagram, explain the formation of final image at least distance of distinct vision in case of astronomical telescope. Define its magnifying power and derive an expression for its magnifying power.

What is the special point about prism binoculars,though it is a pair of astronomical telescopes?

Which two main considerations arekept in mind while designing the objective of an astronomical telescope?

Give three points of difference between refracting type astronomical telescope and reflecting type astronomical telescope.

Two convex lenses of same focal length but of aperture D_1 and D_2(D2 lt D1) ,are used as the objective lenses in two astronomical telescopes having identical eyepieces. what is the ratio of their resolving powers? Which telescope will you prefer and why ? Give reason.

Explain the construction and working of an astronomical telescope. find an expression for its magnifying power in normal adjustment.

Draw a labelled ray diagram to show the image formation in a refracting type astronomical telescope .Why should the diameter of teh objetive of a telescope large?

Define the term resolving power of an astronomical telescope.How does it get affeted on increasing the wavelength of light used?