An astronomical telescope has an angular magn | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(D) For an astronomical telescope with the final image at infinity (normal adjustment),the angular magnification is given by $|m| = \frac{f_o}{f_e} =

Vedclass · Accepted Answer

$f_o = 30 \, cm$ and $f_e = 6 \, cm$

Vedclass · Answer

(D) For an astronomical telescope with the final image at infinity (normal adjustment),the angular magnification is given by $|m| = \frac{f_o}{f_e} = 5$. This implies $f_o = 5f_e$ ... $(i)$. The length of the telescope tube is the sum of the focal lengths of the objective and the eyepiece: $L = f_o + f_e = 36 \, cm$ ... $(ii)$. Substituting $(i)$ into $(ii)$,we get $5f_e + f_e = 36 \, cm$,which simplifies to $6f_e = 36 \, cm$. Thus,$f_e = 6 \, cm$. Substituting $f_e$ back into $(i)$,we get $f_o = 5 	imes 6 \, cm = 30 \, cm$. Therefore,the focal lengths are $f_o = 30 \, cm$ and $f_e = 6 \, cm$.

An astronomical telescope has an angular magnification of magnitude $5$ for distant objects. The separation between the objective and the eyepiece is $36 \, cm$ and the final image is formed at infinity. The focal length $f_o$ of the objective and the focal length $f_e$ of the eyepiece are:

Similar Questions

The focal length of the objective of an astronomical telescope is $1.5 \ m$. Under normal adjustment,the length of the telescope is $1.56 \ m$. The focal length of the eyepiece is: (in $m$)

The magnifying power of an astronomical telescope is $8$ and the distance between the two lenses is $54 \, cm$. The focal lengths of the eye lens and the objective lens will be respectively:

The number of lenses in a terrestrial telescope is

In an astronomical telescope,the focal length of the objective lens is $100 \, cm$ and of the eyepiece is $2 \, cm$. The magnifying power of the telescope for the normal eye is:

Where is the largest telescope in India? What is the diameter of the objective in it?

Vedclass Test Series

Exam Paper Generator

Online Exam Module