Consider the situation below Consider the situation below. If substance 1 can be

Question

Consider the situation below

Consider the situation below. If substance 1 can be treated as a thin film, on top of Substance 2, Find the frequency of the light in air. Find the frequency of the light in substance 1. Find the speed of the light in substance 1 Find the minimum thickness of substance 1 that will make the light invisible when viewed from directly above. Calculate the minimum nonzero thickness of the film such that the resultant intensity of the light reflected back into the air is a maximum.

Explanation / Answer

a) f = C/wavlength

= 3*10^8/(600*10^-9)

= 5*10^14 Hz

b)

f = 5*10^14/1.2 = 4.16*10^14 Hz

c) speed = C/1.2

= 3*10^8/1.2

= 2.5*10^8 m/s

d)

2d = wavelength/2

d = 600/4 = 150 nm

E)

2d = wavelength

d = 600/2 = 300 nm

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