- #1
threewingedfury
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A sheet of glass having an index of refraction of 1.32 is to be coated with a film of material having an index of refraction of 1.46 such that green light with a wavelength of 525 nm (in air) is preferentially transmitted via constructive interference.
(a) What is the minimum thickness of the film that will achieve the result in nm?
I was given the equation:
L=lamda/n2-n1
So 525x10^-9/.14 = 37500 nm
But this isn't right because:
With the numbers n2=1.55 and n1=1.40 the thickness is 169 nm
(a) What is the minimum thickness of the film that will achieve the result in nm?
I was given the equation:
L=lamda/n2-n1
So 525x10^-9/.14 = 37500 nm
But this isn't right because:
With the numbers n2=1.55 and n1=1.40 the thickness is 169 nm