Question

A light wave has a 670 nm wavelength in air. Its wavelength in a transparent solid is 420 nm .

What is the speed of light in this solid? What is the light's frequency in the solid?

Answer 1

Answer: n= ( λ) / ( λn) (1)

λ is wavelength of light in a vacuum

λn is wavelength of light in the medium

n=c/v (2)

c is the speed of light in vacuum or air

v is the velocity of light in the given medium

From eq (1,2)

v=c/n

v=c/(670/420)

frequency of light is constant for any medium.

so wavelength and speed of light varies from a medium to another medium , while Freq is constant.

And , Hence it is all about the given question . I hope you will understand it clearly . Thank you