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(D) The resolving power $(RP)$ of a microscope is given by the formula: $RP = \frac{2n \sin \beta}{\lambda}$, where $n$ is the refractive index of the

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Decreasing the aperture, keeping focal length same

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(D) The resolving power $(RP)$ of a microscope is given by the formula: $RP = \frac{2n \sin \beta}{\lambda}$, where $n$ is the refractive index of the medium, $\beta$ is the semi-vertical angle, and $\lambda$ is the wavelength of light used.Alternatively, in terms of aperture $(a)$ and focal length $(f)$, $RP \propto \frac{a}{\lambda f}$.$1$. Using an oil immersion objective increases the refractive index $(n)$, which increases the resolving power.$2$. Decreasing the wavelength $(\lambda)$ increases the resolving power.$3$. Decreasing the focal length $(f)$ increases the resolving power.$4$. Decreasing the aperture $(a)$ decreases the resolving power.Therefore, the resolving power cannot be increased by decreasing the aperture.

Resolving power of a microscope can $NOT$ be increased by

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