Question

How does the focal length of a convex lens changes if mono chro
matic red light is used instead of violet light?​

Answer 1

Answer:    Refractive index of red light is less than the refractive index of blue light. So, the focal length of the lens will increase when red light is used.

hope it helps

please mark me as a brainliest plz...

Explanation:

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.