1.Two layers of transparent glass with different indices of refraction are stacked on top of eachother, one layer has index of refraction n, =1.600 and path length L, = 20.0µm while the otherhas index of refraction n, =1.430 and path length L, =16.0µm . Each layer is illuminated with aray of light of air wavelength 2 = 640.0 nm and the two parallel rays are initially in phase. Afterpassing through the glass and air the two light rays are recombined at a point far away without furtherphase shifts and there is interference.a. What multiple of 1 gives the phase difference between the two paths after both rays haveemerged from the layers and have been recombined far away from the layers?b. Is the interference totally constructive or totally destructive or partially constructive or partiallydestructive?

The path difference between the rays passing from two layers with different refractive index is,…

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