What do you mean by dispersive power class 12?

Question: What do you mean by dispersive power class 12?

Dispersive power is a measure of how much a transparent medium can separate different colors of light by refraction. It depends on the refractive indices of the medium for different wavelengths of light. The formula for dispersive power is given by:

$$w = \frac{\mu_v - \mu_r}{\mu - 1}$$

where $\mu_v$ and $\mu_r$ are the refractive indices for violet and red light, respectively, and $\mu$ is the refractive index for some intermediate wavelength. Dispersive power is also related to the angular dispersion and mean deviation produced by a prism. For a prism of angle $A$, the dispersive power is given by:

$$w = \frac{\delta_v - \delta_r}{\delta}$$

where $\delta_v$ and $\delta_r$ are the angles of deviation for violet and red light, respectively, and $\delta$ is the mean deviation for some intermediate wavelength. Dispersive power is important for understanding the phenomenon of chromatic aberration and designing achromatic lenses.

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