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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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To increase the brightness of the image. Because, light gathering capacity will increase if aperture of objective is made larger.
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MODERN PUBLICATION-RAY OPTICS AND OPTICAL INSTRUMENTS-Revision Exercises (Very Short Answer Questions)
  1. What is the effect of change of medium on the wavelength of light ?

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  2. A person is not able to see vertical wires clearly in a grid of wires....

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  3. What are the possible causes of hypermetropia ?

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  4. What are the possible causes of myopia.

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  5. Which lens is used for the correction of hypermetropia ? And why ?

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  6. Which lens is used for the correction of myopia and why ?

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  7. What are the far point and near point of the human eye with no...

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  8. Which lens is used for the correction of presbyopia ?

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  9. What is the difference between microscope and telescope ?

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  10. What is meant by linear magnification?

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  11. Write the ray diagram for formation of image in the simple microscope.

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  12. The magnifying power of a compound microscope is

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  13. Derive lens maker's formula for a thin convex lens.

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

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  15. Write the formula for magnifying power and length of tube of an astron...

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

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  17. Can a microscope function as a telescope by inverting it. Can a telesc...

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

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  19. You are given two convex lenses of focal lengths 10 cm and 60 cm. To m...

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  20. What will be the effect on the intensity of the image if the diameter ...

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