draw a plot showing the variation of power of a lens with the wavelength of incident light.
We know from Lens Maker's formula;
If the wavelength increases refractive index decreases as,
hence the focal length increases and as power is reciprocal of focal length it increases with the decrease in 'f'.
So wavelength and power are inversely proportional to each other i.e. with the increase in wavelength power decreases and vice-versa.
Using this relation we can draw a graph showing variation between power of lens and wavelength of the incident light.