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Q. No.An observer is using an astronomical refracting telescope to observe planets in normal adjustment. The focal lengths of the objective and eyepiece used in the telescope construction are \(20\text{m}\) and \(2\text{cm}\) respectively. Consider the following statements about the telescope:
The correct statements are:
| (a) | the distance between the objective and the eyepiece is \(20.02\text{m}.\) |
| (b) | the magnification of the telescope is \(-1000\). |
| (c) | the image of the planet is erect and diminished. |
| (d) | the aperture of the eyepiece is smaller than that of the objective. |
The correct statements are:
| 1. | (a), (b), and (c) | 2. | (b), (c), and (d) |
| 3. | (c), (d), and (a) | 4. | (a), (b), and (d) |
Subtopic: Telescope |
68%
From NCERT
NEET - 2022
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A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope since:
| 1. | a large aperture contributes to the quality and visibility of the images. |
| 2. | a large area of the objective ensures better light-gathering power. |
| 3. | a large aperture provides a better resolution. |
| 4. | all of the above. |
Subtopic: Telescope |
80%
From NCERT
NEET - 2021
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An astronomical refracting telescope will have large angular magnification and high angular resolution when it has an objective lens of:
| 1. | small focal length and large diameter. |
| 2. | large focal length and small diameter. |
| 3. | large focal length and large diameter. |
| 4. | small focal length and small diameter. |
Subtopic: Telescope |
61%
From NCERT
NEET - 2018
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An astronomical telescope has an objective and an eyepiece of focal lengths \(40\text{cm}\) and \(4\text{cm}\) respectively. To view an object \(200\text{cm}\) away from the objective, the lenses must be separated by a distance:
| 1. | \(46.0\text{cm}\) | 2. | \(50.0\text{cm}\) |
| 3. | \(54.0\text{cm}\) | 4. | \(37.3\text{cm}\) |
Subtopic: Telescope |
63%
From NCERT
NEET - 2016
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In an astronomical telescope in normal adjustment, a straight line of length \(L\) is drawn on the inside part of the objective lens. The eye-piece forms a real image of this line. The length of this image is \(l.\) The magnification of the telescope is:
1. \(\frac{L}{l}+1\)
2. \(\frac{L}{l}-1\)
3. \(\frac{L+1}{l-1}\)
4. \(\frac{L}{l}\)
Subtopic: Telescope |
60%
From NCERT
NEET - 2015
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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 are, respectively:
| 1. | \(6\) cm and \(48\) cm |
| 2. | \(48\) cm and \(6\) cm |
| 3. | \(8\) cm and \(64\) cm |
| 4. | \(64\) cm and \(8\) cm |
Subtopic: Telescope |
78%
From NCERT
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A small telescope has an objective lens of a focal length \(144~\text{cm}\) and an eyepiece of focal length \(6.0~\text{cm}.\) What is the magnifying power of the telescope?
| 1. | \(30\) | 2. | \(20\) |
| 3. | \(24\) | 4. | \(32\) |
Subtopic: Telescope |
88%
From NCERT
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Given below are two statements:
| Assertion (A): | If objective and eye lenses of a microscope are interchanged, then it can work as telescope. |
| Reason (R): | The objective lens of telescope has small focal length. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Telescope |
From NCERT
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