Light of wavelength 550 nm comes into a thin slit and produces a diffraction pattern on a board 8.0 m away. The first minimum dark fringe appears 3 mm from the central maximum. What is the width of the slit?

Width of the slit will be equal to 1.47 mm

Explanation:

We have given wavelength of the light

Distance D = 8 m

Distance between first minimum dark fringe and the central maximum is 2 mm

So

We have to find the width of the slit

For the first order wavelength is equal to , here a width of slit

So

So width of the slit will be equal to 1.47 mm

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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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