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Why is the aperture of objective lens of...

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

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This is done to increase the light gathering capacity and hence brightness of image.
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PRADEEP-RAY OPTICS-Very Short Answer (d)
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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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