Optical Instruments: Telescope

An astronomical telescope uses two lenses of powers 10 D and 1 D.Its magnifying power in normal adjustment would be:

Draw a schematic labelled ray diagram of a reflecting type telescope and The objective of a telescope is of larger focal length and of larger aperture (compared to the eyepiece). Why? Give reasons.

State the conditions for the phenomenon of total internal reflection to occur. 

Draw a ray diagram of reflecting type telescope and hence given the advantage of reflecting type telescope.

Draw a labelled ray diagram of a reflecting telescope. Mention its two advantages over the refracting telescope.

An astronomical telescope has a converging eye-piece of focal length $5 \mathrm{cm}$ and objective of focal length $80 \mathrm{cm}$. When the final image is formed at the least distance of distinct vision $(25 \mathrm{cm})$, the separation between the two lenses is

In an astronomical telescope in normal adjustment, a straight black line of length$\mathrm{L}$ is drawn on the objective lens. The eyepiece forms a real image of this line. The length of this image is $\mathrm{Z}$

The focal length of an objective of a telescope is 3 meter and diameter 15 cm. Assuming for a normal eye, the diameter of the pupil is 3 mm for its complete use, the focal length of eye piece must be

An astronomical telescope has a converging eyepiece of focal length $5 \mathrm{cm}$ and an objective of focal length $80 \mathrm{cm}$ . When the final image is formed at the least distance of distinct vision$\left(25 \mathrm{cm}\right)$, the separation between the two lenses is

An observer looks at a tree of height $15 \mathrm{m}$ with a telescope of magnifying power $10$. To him the tree appears

Assertion : In an astronomical telescope, the objective lens has more aperture diameter

Reason : If we increase the focus distance of the objective lens, the magnification power of the telescope increases

Why does a reflecting telescope form a brighter image than a refracting telescope?

What is chromatic aberration? Why is there no chromatic aberration in a reflecting telescope?

Which of the following statements is true regarding telescopes?

What is a reflecting type telescope? Give an example. Also, explain its advantages over a refracting type telescope.

List two advantages of reflecting telescope over refracting telescope.

Expand GMRT:

Two convex lenses of focal lengths $0.3 \mathrm{m}$ and $0.05 \mathrm{m}$ are used to make a telescope. Find the distance between the two lens such that final image is formed at infinity ?

The final image in an astronomical telescope with respect to object is

A small telescope has an objective lens of focal length $144 \mathrm{c}\mathrm{m}$ and an eyepiece of focal length $6.0 \mathrm{c}\mathrm{m}.$ What is the separation between the objective and the eyepiece?