in the single-slit diffraction experiment, the slit width is 2.10-5 m, the observation screen is 0.5 m from the slit. Illumination has a wavelength of 480 nm through the slit and has image diffraction on the viewing screen. Calculate the width of the bright fringe adjacent to the central bright fringe

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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the answer is 12 as i may remember

: )