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

The dispersive power is maximum for the material

The refractive index of flint glass for blue $F$ line is $1.6333$ and red $C$ line is $1.6161.$ If the refractive index for yellow $D$ line is $1.622,$ the dispersive power of the glass is

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

The deviations caused in red,yellow,and violet colors for a crown glass prism are $2.84^\circ$,$3.28^\circ$,and $3.72^\circ$ respectively. The dispersive power of the prism material is:

Dispersive power depends upon