Telescope

The magnifying power of a telescope is . When it is adjusted for parallel rays the distance between the objective and eyepiece is . The focal length of the lenses is:

1.		2.
3.		4.

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

1.		2.
3.		4.

An astronomical refracting telescope will have large angular magnification and high angular resolution when it has an objective lens of:

1.	small focal length and large diameter.
2.	large focal length and small diameter.
3.	large focal length and large diameter.
4.	small focal length and small diameter.

A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope since:

1.	a large aperture contributes to the quality and visibility of the images.
2.	a large area of the objective ensures better light-gathering power.
3.	a large aperture provides a better resolution.
4.	all of the above.

A small telescope has an objective of focal length and an eyepiece of focal length The magnifying power of the telescope for viewing a distant object is:
1.
2.
3.
4.