Vedclass
Class 12PhysicsRay Optics and Optical InstrumentsTelescope
Easy

All of the following statements are correct except:

  • A
    The total length of an astronomical telescope is the sum of the focal lengths of its two lenses.
  • B
    The image formed by the astronomical telescope is always erect because the effect of the combination of the two lenses is divergent.
  • C
    The magnification of an astronomical telescope can be increased by decreasing the focal length of the eye-piece.
  • D
    The magnifying power of the refracting type of astronomical telescope is the ratio of the focal length of the objective to that of the eye-piece.
Share

Explore More

Browse All

Question Bank

12

All Subjects

Class 12 Questions

Class 12

Physics Questions

Chapter

Ray Optics and Optical Instruments

Subtopic

Telescope

Similar Questions

Diameter of the moon is $3.5 \times 10^3 \, km$ and its distance from earth is $3.8 \times 10^5 \, km$. It is seen by a telescope whose objective and eyepiece have focal lengths $4 \, m$ and $10 \, cm$ respectively. What will be the angular diameter of the image of the moon in degrees?

Medium
View Solution

An astronomical telescope has an objective and an eyepiece of focal lengths $40\, cm$ and $4\, cm$ respectively. To view an object $200\, cm$ away from the objective,the lenses must be separated by a distance of.....$cm$.

MediumNEET 2016
View Solution

For a distant object,the angular magnification of an astronomical telescope is $5$. The distance between the objective and the eyepiece is $36 \, cm$,and the final image is formed at infinity. What are the focal lengths of the objective $(f_o)$ and the eyepiece $(f_e)$?

Medium
View Solution

The focal lengths of the objective and eye lenses of a telescope are respectively $200 \, cm$ and $5 \, cm$. The maximum magnifying power of the telescope will be:

Medium
View Solution

Four lenses of focal length $+ 15\, cm, + 20\, cm, + 150\, cm$ and $+ 250\, cm$ are available for making an astronomical telescope. To produce the largest magnification,the focal length of the eye-piece should be.....$cm$

EasyAIIMS 2001
View Solution

Vedclass Products

For Students

Vedclass Test Series

Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.

Start Free Trial
For Teachers

Exam Paper Generator

Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.

Try Free
For Institutes

Online Exam Module

Live online exams with unlimited students, 360° analytics & white-label branding.

See Demo