- 1(current)
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 |
65%
From NCERT
NEET - 2022
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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 |
59%
From NCERT
NEET - 2015
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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 |
60%
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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Q. No.
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