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(C) The magnifying power $(m)$ of a microscope is inversely proportional to the focal length $(f)$ of the objective lens,given by $m \propto \frac{1}{

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Violet colour

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(C) The magnifying power $(m)$ of a microscope is inversely proportional to the focal length $(f)$ of the objective lens,given by $m \propto \frac{1}{f}$.According to Cauchy's dispersion formula,the refractive index of a material is higher for shorter wavelengths.Since the wavelength of violet light is the shortest among the visible spectrum,the focal length $(f)$ of the lens is minimum for violet light.Because $m \propto \frac{1}{f}$,a smaller focal length results in a higher magnifying power.Therefore,the magnifying power of a microscope is maximum for violet colour.

For which of the following colours will the magnifying power of a microscope be maximum?

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