All of the following statements are correct except:
- AThe total length of an astronomical telescope is the sum of the focal lengths of its two lenses.
- BThe image formed by the astronomical telescope is always erect because the effect of the combination of the two lenses is divergent.
- CThe magnification of an astronomical telescope can be increased by decreasing the focal length of the eye-piece.
- DThe 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.
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Similar Questions
$A$ small telescope has an objective lens of focal length $140 \ cm$ and an eyepiece of focal length $5 \ cm$. The magnifying power of the telescope for viewing a distant object when the telescope is in normal adjustment is . . . . . . .
$A$ giant refracting telescope at an observatory has an objective lens of focal length $15 \, m$. If an eyepiece of focal length $1.0 \, cm$ is used,what is the angular magnification of the telescope?
Easy
View SolutionThe length of a telescope is $36 \ cm$. The focal lengths of its lenses can be
Easy
View SolutionAn 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:
MediumIIT 1989
View SolutionThe focal length of the objective and the eyepiece of a telescope are $50\,cm$ and $5\,cm$ respectively. If the telescope is focused for distinct vision on a scale distant $2\,m$ from its objective,then its magnifying power will be
DifficultJEE MAIN 2013
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