Agrating with 400 lines per mm is illuminated with light of wavelength 600.0 nm. a determine the angles at which maxima are observed b determine the largest order that can be seen with this grating and this wavelength

(a) angles of maxima = 13.9°, 28.7° , 46°, 73.7° on either side

b] largest order = 4

Explanation:

(a) for diffraction maxima,

Here, m is the order, is the wavelength,  is the angle at which maxima occur, d is inter planar spacing.

And we know that lines per mm (N) is related with d as,

Given that the wavelength is,

And

Now,

Therefore,

Here, m can be 1,2,3,4 as sin theta has to be less than 1.

Therefore, angles of maxima = 13.9°, 28.7° , 46°, 73.7° on either side

b] largest order = 4

i don't understand. explain it clearly

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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