Calculate the dispersive power for crown glass from the given data if $\mu_v = 1.5230$ and $\mu_r = 1.5145$.

Dispersive power depends on the following:

For a material,the refractive indices for red,violet,and yellow color light are respectively $1.52, 1.64,$ and $1.60.$ The dispersive power of the material is:

If the refractive indices of a prism for red,yellow,and violet colours are $1.61$,$1.63$,and $1.65$ respectively,then the dispersive power of the prism will be:

The dispersion for a medium of wavelength $\lambda$ is $D$. Then,the dispersion for the wavelength $2\lambda$ will be:

If the refractive indices of crown glass for red,yellow,and violet colours are respectively $\mu_r$,$\mu_y$,and $\mu_v$,then the dispersive power of this glass would be