00:01
Okay, that's being some problem 50.
00:03
So the basic idea of this problem is you are going to design greetings to make the experiment of the diffraction for the visible light.
00:16
So for the basic knowledge of the visible light, we don't know that.
00:20
The lower limit of the wavelengths of visible light is violet light, and the wavelengths of violet light is 380 nanometers.
00:28
And 80 nanometers.
00:31
And for the upper limit of the spectrum, the wavelength of the red light is 750 nanometer.
00:42
And we suppose the distance between each slit on the gratings is d and d equals one over n.
00:50
What's n here? n is the number of the sleet of each unit length.
00:59
Here is actually a riddenly and has a unit.
01:05
The unit is actually the per meters.
01:12
Okay.
01:13
So and the next is this to solve this problem problem, it addressed to the relation between the first order diffraction angle of the red light and the violet light.
01:34
The difference between those two angles equals 27 degrees.
01:41
So the question is, what will be the number n here? i'll say for each centimeter, in each centimeter, how many days we'll find on the greetings? and so next problem is b, i just ask, okay, so uh, suppose we'll have the first order of the diffraction for the spectrum, then what will be this spectrum begin? i mean, where it will begin and where it will end at which angle? so basically, we are going to find the angle for the first order diffraction of both the dry light and the white light.
02:32
And to solve this problem, it addressed to the formula, it 36 17s, which side of the distance d times sine theta equals m, i mean the integral number times your wavelength of light lambda here.
02:53
And for our first other diffraction, actually we are going to solve the sine theta 1, which means here m equals 1.
03:09
Okay, so basically if we are related in specific equation, it will be something like this...