Q. No.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 |
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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 |
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In normal adjustment, for a refracting telescope, the distance between the objective and eyepiece is \(30\) cm. The focal length of the objective, when the angular magnification of the telescope is \(2,\) will be:
1. \(20\) cm
2. \(30\) cm
3. \(10\) cm
4. \(15\) cm
1. \(20\) cm
2. \(30\) cm
3. \(10\) cm
4. \(15\) cm
Subtopic: Telescope |
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A pair of stars have an angular separation of \(1'\)(one minute of arc) from earth. It is viewed with a telescope whose objective has a focal length of \(100\) cm and an eyepiece with a focal length of \(1\) cm. The stars will appear with an angular separation of:
1. \(1.67^{\circ}\)
2. \(1.87^{\circ}\)
3. \(1.99^{\circ}\)
4. \(2.41^{\circ}\)
1. \(1.67^{\circ}\)
2. \(1.87^{\circ}\)
3. \(1.99^{\circ}\)
4. \(2.41^{\circ}\)
Subtopic: Telescope |
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A small telescope has an objective of focal length \(140~\text{cm}\) and an eyepiece of focal length \(5.0~\text{cm}\) The magnifying power of a telescope for viewing a distant object is:
1. \(28\)
2. \(17\)
3. \(32\)
4. \(34\)
1. \(28\)
2. \(17\)
3. \(32\)
4. \(34\)
Subtopic: Telescope |
66%
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NEET - 2024
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An astronomical refractive telescope has an objective of focal length \(20~\text{m}\) and an eyepiece of focal length \(2~\text{cm}\).
Choose the correct option from the given ones:
| (A) | The length of the telescope tube is \(20.02~\text{m}\). |
| (B) | The magnification is \(1000\). |
| (C) | The image formed is inverted. |
| (D) | An objective of a larger aperture will increase the brightness and reduce chromatic aberration of the image. |
| 1. | (A) and (D) only |
| 2. | (A), (B) and (C) only |
| 3. | (B) and (D) only |
| 4. | (C) and (D) only |
Subtopic: Telescope |
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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 objective lens will be 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 |
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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 |
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NEET - 2021
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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?
| 1. | \(1175\) | 2. | \(1250\) |
| 3. | \(1300\) | 4. | \(1500\) |
Subtopic: Telescope |
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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 |
64%
From NCERT
NEET - 2022
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