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  • An astronomical telescope has a large aperture toOption: 1 reduce spherical aberrationOption: 2</strong

An astronomical telescope has a large aperture to

Option: 1

reduce spherical aberration


Option: 2

have high resolution


Option: 3

increase span of observation


Option: 4

have low dispersion


Answers (1)

best_answer

The aperture of an astronomical telescope is defined as the diameter of the objective lens.In telescopes since, the stars are very far away from away us and emit light internsities, we need a large aperture to increase the amount of light entering the telescope

The bigger the aperture, the sharper and brighter the view will be. In case of astronomical telescope, if the aperture is large then more light rays from the object will enter the telescope and hence resolution of the image will be high.

Since resolution of telescope power is R = D/1.22 λ , where D is the diameter of the objective lens of Telescope.

Clearly, larger the aperture, larger is the value of D, more is the resolving power or resolution.

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Gunjita

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