Question

How speed of light change is different medium?

Answer 1

When light enters a denser medium(like from air to glass) the speed and wavelength of the light wave decrease while the frequency stays the same. ... Although the speed of light is no longer constant when we think aboutdifferent media, we do know that lightalways travels fastest in a vacuum

Answer 2

When light enters a denser medium (eg: from air to glass) the speed of wavelength of light waves decreases. Light moves slower through denser media.