The property of light that explains the formation of coloured images due to thick lenses is

Dispersive power depends on the following:

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

The angle of a prism is $10^o$. The refractive indices for red and violet colours are $1.51$ and $1.52$ respectively. Find the dispersive power.

If the refractive indices of red,violet,and yellow lights are $1.42$,$1.62$,and $1.50$ respectively for a medium,its dispersive power will be:

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: