English

Draw a ray diagram depicting the formation of the image by an astronomical telescope in normal adjustment.

Advertisements
Advertisements

Question

Draw a ray diagram depicting the formation of the image by an astronomical telescope in normal adjustment.

Advertisements

Solution

shaalaa.com
  Is there an error in this question or solution?
2016-2017 (March) All India Set 1

RELATED QUESTIONS

  1. For the telescope is in normal adjustment (i.e., when the final image is at infinity)? what is the separation between the objective lens and the eyepiece?
  2. If this telescope is used to view a 100 m tall tower 3 km away, what is the height of the image of the tower formed by the objective lens?
  3. What is the height of the final image of the tower if it is formed at 25 cm?

You are given the following three lenses. Which two lenses will you use as an eyepiece and as an objective to construct an astronomical telescope ? Give reason

Lenses Power (D) Aperture (cm)
L1 3 8
L2 6 1
L3 10 1

With regard to an astronomical telescope of refracting type~ state how you will increase its:

1) magnifying power

2) resolving power


Write two important limitations of a refracting telescope over a reflecting-type telescope.


A small telescope has an objective lens of focal length 150 cm and an eye piece of focal length 5 cm. If this telescope is used to view a 100 m high tower 3 km away, find the height of the final image when it is formed 25 cm away from the eye piece.


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


The eyepiece of an astronomical telescope has a focal length of 10 cm. The telescope is focussed for normal vision of distant objects when the tube length is 1.0. m. Find the focal length of the objective and the magnifying power of the telescope.


A Galilean telescope is 27 cm long when focussed to form an image at infinity. If the objective has a focal length of 30 cm, what is the focal length of the eyepiece?


Draw a ray diagram of Astronomical Telescope for the final image formed at infinity


A small telescope has an objective of focal length 140 cm and an eye piece of focal length 5.0 cm. The magnifying power of telescope for viewing a distant object?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×