Problem 22.05 part a in a double slit experiment, if the separation between the two slits is 0.050 mm and the distance from the slits to a screen is 2.5 m, find the spacing between the first-order and second-order bright fringes when coherent light of wavelength 600 nm illuminates the slits.

a. 9.0 cm
b. 6.0 cm
c. 1.5 cm
d. 4.5 cm
e. 3.0 cm

Explanation:

Two slits with separation, d, and distance from the slits to a screen, L, produce bright fringes. The spacing, x, between the central fringe and the n-order bright fringe.

The spacing between the first and second bright is:

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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