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why should objective of a telescope have...

why should objective of a telescope have larger focal length ?

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To obtain larger magnifying power and better intensity of image.
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Assertion : If objective and eye lens of a mcroscope are interchanged then it can work as telsecope. Reason : The object of telescope has large focal lengths.

Consider the following statements about a microscope and a telescope 1. Both the eyepiece and the objective of a microscope are convex lenses. 2. The focal length of the objective of a telescope is lerger than the focal length of its eyepiece. 3. The magnification of a telescope increases with the increases in focal length of its objective. 4. The magnification of a microscope increases with the increases in focal length of its objective. Which of the statements given above are correct?

Assertion : If objective and eye lenses of a microscope are interchanged then it can work as telescope. Reason : The objective of telescope has small focal length.

The objective of an astronomical telescope has a focal length of 80cm . The telescope is focused for normal vision of distant objects when the tube length is 1.0m .If the focal length of eye piece is f_(e) (in cm ) and magnifying power of telescope is m then the value of (f_(e))/(m) is :

The objective of a small telescope has focal length 120 cm and diameter 5 cm. The focal length of the eye piece is 2 cm. The magnifying power of the telescope for distant object is -

The aperture and focal length of the objective of telescope are large, why?

PRADEEP-RAY OPTICS-Very Short Answer (d)
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  2. A person looking at a mesh of crossed wires is able to see the vertica...

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  3. What is meant by depth of focus ?

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  4. What is visual angle ?

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  5. An astronomical telescope uses lenses of power 10 D and 1 D. What is i...

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  6. Why is the aperture of objective lens of a telescope taken large ?

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  7. Why is power of objective lens of a telescope kept as small as possibl...

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  8. Why does Galilean telescope have a smaller field of view ?

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  9. In which, microscope or telescope, the difference in the focal lengths...

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  10. Why do we prefer a magnifying glass of smaller focal length ?

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  11. What do you understand by normal adjustment of a telescope ?

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  12. What is the distance between objective and eye lens of telescope in no...

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  13. Objective of a compound microscope should have small focal length. Why...

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  14. why should objective of a telescope have larger focal length ?

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  15. Can a terrestrial telescope be used for observing astronomical objects...

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  16. What is the main limitation of Galileo's telescope ?

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  17. What is the eye ring of a telescope or microscope ?

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  18. Is angular magnification of a telescope equal to ratio of diameters of...

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  19. What is meant by focal plane of a lens ?

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  20. Does the magnifying power of a microscope depend on colour of light us...

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