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Q.

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

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a

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

b

The focal length of the objective has to be increased

c

The aperture of the objective has to be increased 

d

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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