Explain briefly how the focal length of would remain same. a convex lens changes with increase in wavelength of incident light.

Explanation

The refractive index of the material of a lens decreases with increase in wavelength of incident light. Since focal length of a lens is given by.
` 1/f = (mu - 1) ((1)/(R_1) - (1)/(R_2) )`
it follows that focal length of the lens will increases with increase in wavelength of incident light.