A simple microscope is used to see an object | vedclass

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(A) The magnifying power $(M)$ of a simple microscope is given by the formula: $M = 1 + \frac{D}{f}$, where $D$ is the least distance of distinct visi

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decreases

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(A) The magnifying power $(M)$ of a simple microscope is given by the formula: $M = 1 + \frac{D}{f}$, where $D$ is the least distance of distinct vision and $f$ is the focal length of the convex lens.According to Cauchy's dispersion formula, the refractive index $(\mu)$ of a material is higher for shorter wavelengths (blue light) and lower for longer wavelengths (red light).Since the focal length $f$ of a lens is related to the refractive index by the lens maker's formula, $f$ increases as the wavelength of light increases.Therefore, the focal length for red light $(f_{red})$ is greater than the focal length for blue light $(f_{blue})$.As $M = 1 + \frac{D}{f}$, an increase in focal length $f$ results in a decrease in the magnifying power $M$.Thus, when changing from blue light to red light, the magnifying power decreases.

$A$ simple microscope is used to see an object first in blue light and then in red light. Due to the change from blue to red light, its magnifying power

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