Lightwaves travel from the air into a lens made of glass. Their velocity decreases as they enter the glass. How does this affect the frequency and wavelength of the lightwaves?

Question

anonymous · Answer

The frequency and wavelength must go down.

anonymous · Answer

Hmm ... The frequency depends on the source producing the light. It is unaffected I think. $\color{green}{v =f \lambda } $ so with frequency remaining constant a decrease in speed will result in a decrease in wavelength, since they are directly proportional to each other.