Diffraction pattern due to a lens with focal length f

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The discussion revolves around the diffraction pattern created by a laser beam passing through a grating and then through a focusing lens. The distance between the maxima at the focal point is denoted as d, and the problem seeks to determine the distance of the maxima immediately after the grating. The width of the laser beam is noted to influence the illumination of the grid, thereby affecting the resulting diffraction pattern. There is a suggestion that the complexity of the problem may exceed typical expectations for a schoolwork assignment. The conversation emphasizes the importance of understanding the relationship between the laser, grating, and lens in analyzing diffraction patterns.
Optik123
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Suppose one light up with a laser on a grid with grid constant g. The grating is followed by a focusing lens with a focal length of f. In the focus (or immediately in front of it) the maxima have a distance d. How large was the distance of the maxima immediately after the grating?

scheme:
Laser beam----------grating=======Lens=======focal point(here the maxima have distance d from each other)

Note:
The angle of the k.th maximum is given by
g)}.png


Best wishes and many thanks!
 
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Welcome to the PF. :smile:

Can you show your work on this problem? Is this a schoolwork problem?
 
@Optik123 The width of the laser beam will affect how much of the grid is illuminated, which will affect the diffraction pattern. It's like a Windowing Function being applied. Are you sure that the problem you have is expected to be as complicated as this? Is the mention of 'laser' just to imply a good coherent source?
 

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