Draw a plot showing the variation of power of a lens with the wavelength of the incident light.

Explanation

Formula :
Refractive index ` = A + (B)/(lamda^2)` where `lamda` is the wavelength
Power of a lens P `= 1/f = (n_g - 1) ((1)/(R_1) = (1)/(R_2))`

Clearly, power of a lens (`n_g - 1`). This implies that the power of a lens decreases with increase of wavelength (`P prop (1)/(lamda^2)` nearly). The plot is shown in figure alongside .