00:01
So as light travels from a vacuum to a substance such as glass, we want to know what happens to its wavelength, its speed, and its frequency.
00:11
So this would be the vacuum where the index of refraction is one.
00:14
And we can use glass.
00:15
The index of refraction for glass is about 1 .5.
00:20
But it doesn't really matter what it is to answer the question.
00:24
The wavelength, when the wave gets to the substance where light is able to pass through, but it's actually inhibited from passing through a little bit because of its structure, the wavelength shrinks.
00:39
So it gets smaller.
00:42
So if i can draw this properly, something like this...