To increase both the resolving power and magnifying power of a telescope.

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Both the focal length and aperture of the objective has to be increased

The focal length of the objective has to be increased

The aperture of the objective has to be increased

The wavelength of light has to be decreased

answer is A.

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Detailed Solution

Decreasing the wavelength of light, increases the resolving power and magnifying power of telescope.RP=a1.22λ m=-f0fe1+feD

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