Question

How does focal length of a lens change when red light incident on it is replaced by violet light?​

Answer 1

Answer:

So here we go

Red colour in the white light when passed through the prism refracts the least where as the violet rays refract the most....

Till the question is how the lenses in our eyes change their focal length, they are controlled by the ciliary muscles in our eyes.

Hope it helps ✌

Answer 2

Answer:

Focal length of the convex lens increases with the increase in wavelength. We know wavelength of red is more than the wavelength of violet. So, as the wavelength decreases the focal length also decreases.