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Large aperture of telescope are used for...

Large aperture of telescope are used for

A

reduced spherical aberration

B

have high resolution

C

increase span of observation

D

have low dispersion

Text Solution

Verified by Experts

The correct Answer is:
B
The resolving power of an astronomical telescope is =`(D)/(1.22 lamda)` where D is the diameter of the objective lens . In order to improve the resolution of an astronomial telescope , one has to increase the diameter , i.e, linear aperture of the astronomial telescope
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ALLEN -GEOMETRICAL OPTICS-EXERCISE-05 (A)
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  2. Which of the following is used in optical fibres ?

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  3. Large aperture of telescope are used for

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  4. The image formed by an objective of a telescope is-

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  6. A light ray is incident perpendicular to one face of a 90^@ prism and ...

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  7. A plano convex lens of refractive index 1.5 and radius of curvature 30...

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  8. A fish looking up through the water sees the outside world, contained ...

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  9. Two point white dots are 1 mm apart on a black paper. They are viewed ...

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  10. A thin glass (refractive index 1.5) lens has optical power of - 5D in ...

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  11. The refractive index of glass is 1.520 for red light and 1.525 for blu...

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  12. Two lenses of power - 15D and + 5D are in contact with each other. The...

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  13. A student measures the focal length of a convex lens by putting an obj...

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  14. The refractive index of transparent cylindrical rod is (2)/(root3) . A...

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  15. Let the x-z plane be the boundary between two transparent media. Mediu...

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  16. A car is fitted with a convex side-view mirror of focal length 20 cm. ...

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  17. When monochromatic red light is used instead of blue light in a convex...

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  18. A beaker contains water up to a height h(1) and kerosene of height h(2...

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  19. An object 2.4 m in front of a lens forms a sharp image on a film 12 cm...

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  20. The graph between angle of deviation (delta) and angle of incidence (i...

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