When the diameter of the aperture of the obje | vedclass

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

Question

(C) The magnifying power $(M)$ of an astronomical telescope is given by the ratio of the focal length of the objective $(f_o)$ to the focal length of

Vedclass · Accepted Answer

Magnifying power remains the same but resolving power is increased

Vedclass · Answer

(C) The magnifying power $(M)$ of an astronomical telescope is given by the ratio of the focal length of the objective $(f_o)$ to the focal length of the eyepiece $(f_e)$,i.e.,$M = f_o / f_e$. Since the focal lengths of the lenses do not change when the diameter of the aperture is increased,the magnifying power remains the same. The resolving power of a telescope is defined as $1 / \Delta	heta = D / 1.22\lambda$,where $D$ is the diameter of the objective aperture and $\lambda$ is the wavelength of light. As the diameter $D$ increases,the resolving power increases. Additionally,the light-gathering capacity (intensity of the image) increases as it is proportional to the square of the diameter $(I \propto D^2)$.

When the diameter of the aperture of the objective of an astronomical telescope is increased,its

Similar Questions

When a telescope is adjusted for parallel light,the distance of the objective from the eyepiece is found to be $80 \,cm$. The magnifying power of the telescope is $19$. The focal lengths of the lenses are

The focal length of the objective and the eyepiece of a telescope are $100\, cm$ and $5\, cm$ respectively. If the final image is formed at the least distance of distinct vision,the magnification of the telescope is:

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

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:

On which of the following does the magnifying power of a telescope depend?

Vedclass Test Series

Exam Paper Generator

Online Exam Module