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The aperture and focal length of the obj...

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

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Since the aperture is large intensity is increased, focal length is large to have angular magnification.
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AAKASH INSTITUTE-RAY OPTICS AND OPTICAL INSTRUMENTS-ASSIGNMENT (SECTION - D)
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  2. A : Plane and convex mirrors can produce real images of objects. R :...

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  3. A : A virtual image cannot be caught on a screen but it can be photogr...

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  4. A : When a diver under water looks obliquely at a fisherman standing o...

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  5. A : The apparent depth of a tank of water decreases if viewed obliquel...

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  6. A : Proper cutting of diamond makes it sparkle. R : Diamond has very...

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  7. A : The angle subtended at the eye by an object is equal to the angle ...

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  8. A : In viewing through a magnifying glass, angular magnification decre...

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  9. A : Magnifying power of a simple microscope cannot be increased beyond...

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  10. A : The objective and the eye-piece of a compound microscope should ha...

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  11. A : When viewing through a compound microscope, our eyes should be pos...

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  12. A : The peculiar fish Anableps anableps swims with its eyes partially ...

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  13. A : A virtual image cannot be produced on screen. R : The light ener...

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  14. A : Lenses of large aperture suffer from spherical aberration. R : T...

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  15. A : The image formed by a concave lens is always virtual. R : The ra...

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  16. A : When two lenses in contact form an achromatic doublet, then the ma...

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  17. Assertion : A reflecting type telescope is preferred over refracting t...

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