And let's see what happens with 400 then. That's going to give me 71 1000 lines per meter. So that's going to give me per centimetre. So if I change that Ah 05 that would now give me 71,000 lines per meter because you would be in lines per meter times. So I'm just going Teoh, change this Not one meter, but let's say five centimeters. So then I would have to have 600 40,000 lines per centimeter. Let's put this in tow calculator sign of inverse tangent of 1/2 times 700 nano meters. Then my number of lines would have to be. Um X over l let me think about let's say that I want my X over l to be somewhere around 1/2 lake, one meter and two meters. I actually want to look here where m is one, then for 790 meters. That would be visible light Well, if I want to be able to see both 407 100 nano meters, then I'm gonna leave em be one.
And then he emits in response, um, wavelengths between 400 and 700 non amir's. And let's just say that my laser has a wavelength of 490 meters and I shine it on two substances that have their electrons excited. This is the peaks from the center to the wavelength. Ah, then we could relate the distance from the center. So if we know how many lines per meter, we know the distance from the paper. So now I have sign Fada over lower case l putting these equations together, I would get i m lambda, uh, equals the sign of the inverse tangent. I'm gonna call this lower case l Where lower case l is lines per meter. L um, where l is the length to the paper now were normally given for a diffraction grating the number of lines per meter. So, in a diffraction grating, the equation is m lambda equals D sign they'd And the tangent of Fada is X over.
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