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#1
The light source emits a range of wavelengths from 500 nm to 700 nm. The light is incident on a diffraction grating that has 10 000 lines per metre.
(i) Calculate the angle from the straight through direction at which the first order maximum for the 500 nm wavelength is formed.
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1 year ago
#2
(Original post by gabyiul728)
The light source emits a range of wavelengths from 500 nm to 700 nm. The light is incident on a diffraction grating that has 10 000 lines per metre.
(i) Calculate the angle from the straight through direction at which the first order maximum for the 500 nm wavelength is formed.
Have you studied diffraction gratings yet? There is really only one equation you need to know about them, often called "the diffraction grating equation". It connects the order of the maximum you are looking at (n), the wavelength of the light (lambda), the angle that the maximum is formed at (theta) and the grating spacing (d).

Most of this is given to you in the question. You will have to calculate the grating spacing (that is, the distance between two adjacent lines on the diffraction grating) from the information about the number of lines per metre.
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