An astronomical telescope has large apet...

An astronomical telescope has large apeture to

redurece spherical aberraion

have high resolution

increase span of observation

have low dispersion

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KEY CONCEPT: The resolving power of a telescope `R.P=(D)/(1.22lamda)` Where D= diameter of the objective lens
`lamda=wavelength` of light
Clearly, larger the aperture, larger is the value of D, more is the resolving power or resolution.

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