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In an astronomical telescope , the focal...

In an astronomical telescope , the focal length and the aperture of the objective are …… and the focal length and the aperture of the eyepiece are taken …… as compared to those of the objective [fill in the blank].

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In an astronomical telescope , focal length of the objective is made

In an astronomical telescope, focal length of the objective is made

An astronomical refractive telescope has an objective of focal length 20 m and an eyepiece of focal length 2 cm .

Why should the objective of a telescope have large focal length and large aperture? Justify your answer.

The final image in a terrestrial telescope is ……….and ……….with respect to the object [fill in the blank].

To increase magnification of a compound microscope , the objective and the eyepiece of …. Focal lengths and the microscope tube of ….. Length are to be taken [fill in the blanks] .

The final image is an astronomical telescope is …….and ……..with respect to the object [fill in the blank] .

Resolving power of a telescope_____with the increase of the diameter of its objective [Fill in the blank.]

CHHAYA PUBLICATION-OPTICAL INSTRUMENTS-Exercise (Very short Answer Type Questions)
  1. For a normal eye the least distance of distinct vision is …….. Fill in...

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  2. Vision of normal eye ranges from …… to ……… fill in the blanks.

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  3. How can the defect of astigmatism be corrected ?

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  4. The minimum distance of distinct vision for a person is 1m . What eye...

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  5. …… is the eye -defect which old people usually suffer from fill in th...

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  6. Cylindrical lens are used as a remedy for … fill in the blank.

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  7. For long -sightedness , …… lens should be used [fill in the blank ].

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  8. For short-sightedness , ….. Lens should be used fill in the the blank...

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  9. If the least distance of distinct vision is D and focal length of th...

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  10. If the length of the tube of a compound microscope is increased , the ...

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  11. If the focal length of a microscope is small , magnification is ……[ fi...

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  12. To increase magnification of a compound microscope , the objective and...

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  13. In what type of telescope is the final image erect ?

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  14. What is used for the objective of a reflecting telescope ?

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  15. Write the names of two ordinary types of the telescope.

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  16. Is the length of the instrument to be changed if the focal length of ...

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  17. In an astronomical telescope , the focal length and the aperture of th...

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  18. The final image is an astronomical telescope is …….and ……..with respec...

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  19. The final image in a terrestrial telescope is ……….and ……….with respect...

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  20. In Galileo's telescope , the objective is …..lens but the eyepiece is ...

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