Why objective lens has larger aperture and focal length tham eyepiece in astronomical telescope?
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22
Because A telescope's light gathering power and ability to resolve small detail is directly related to the diameter (or aperture) of its objective (the primary lens or mirror that collects and focuses the light).
The larger the objective, the more light the telescope collects and the finer detail it resolves.
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Answered by
8
The objective of a telescope have large focal length and large aperture because large focal length enhances the magnifying power of the telescope and large aperture help in collecting large amount of light coming from the object so that a bright image is obtained.
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