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Wave optics in college physics
For (1) (2) and (3), it is necessary to remember the formula of central opening pattern width l=2* wavelength * lens focal length/slit width;

For (4), since the receiving screen is on the focal plane of the lens, the parallel rays with the diffraction angle θ with the optical axis converge to one point of the receiving screen (θ=0 degree for the rays forming the main maximum, that is, the rays parallel to the optical axis). When the single slit moves up in parallel, the light whose original θ is 0 degrees also moves up in parallel, but it is still parallel to the optical axis. According to the lens theory, parallel light converges to a point on the focal plane, so the convergence point of these lights is still the original position.