When light goes from one material into another material having a higher index of refraction, it

Answer

When the light goes from one medium to another medium with higher refractive index the velocity of the ray decreases, wavelength of the ray also decreases.

But the frequency of the ray when it enters the medium of higher refractive index remain same.

So, we can conclude that speed of ray and wavelength decrease but frequency remain unchanged.

i think it would be 5