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14/09/2021 10:45 am
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A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope since:
(1) a large aperture contributes to the quality and visibility of the images.
(2) a large area of the objective ensures better light-gathering power.
(3) a large aperture provides a better resolution.
(4) all of the above.
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14/09/2021 10:47 am
Correct answer: (4) all of the above.
Explanation:
MP = \(\frac{f_0}{f_e}\)
R.P. = \(\frac{a}{1.22 \lambda}\)
large aperture(a) of the objective lens provides better resolution
∴ good quality of image is formed and also it gathers more light.