00:02
Okay, so for the first part of this question, we're asked to find the speed of light through a material of a certain refractive index.
00:10
Okay, and we can define the refractive index as equal to the ratio of speed of light by the speed of light within the material.
00:25
So this is speed of light in a vacuum, the constant we're all used to use.
00:29
Okay, and here we just want to find our speed.
00:34
Speed so we're just going to rearrange this equation for part a okay and so we can find that v is going to be equal to our speed of light divided by a factor index and that's going to be three times 10 to the 8 and then we're going to divide that by 1 .477 7.
01:15
Okay we'll just go into a calculator.
01:25
We find that you get 2 .03 times 10 to the 8 meters a second.
01:36
Okay.
01:39
And so for the next part of this question, we're trying to find the wavelength of these light within the liquid.
01:50
Okay...