A) the focal length of the objective has to be increased
B) both the focal length and aperture of the objective has to be increased
C) the wavelength of light has to be decreased
D) the aperture of the objective has to be increased
Correct Answer: B
Solution :
Magnifying power \[=\frac{{{f}_{0}}}{{{f}_{e}}}\] Resolving power \[\propto \frac{d}{\lambda }\]Focal length and aperture of objective lens must be increased.
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