Because the frequency of light is inversely related to the wavelength of light.
The equation for speed, wavelength, and frequency are:
c = λf
As we know that
c= 3×10^8m/s is the speed of light
λ is the wavelength of light
f is the light frequency
So from here we see that frequency and wavelength is inversely related so if one increases than other must decreases.
Like when frequency of light is greater, the wavelength must becomes less than its original value. This does not contradict the postulate that the speed of light remains the same. Because both these parameters adjust with respect to each other to maintain the constant.
Read more about Frequency and wavelength:
https://brainly.com/question/12711773
#SPJ4
