•Condition for constructive interference
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•                                  mλ
•                         2d = ------
•                                    η
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•
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•If distance (d) is multiple (m) of wavelength (λ) then it won’t be interfered with •Concept of Order – constructive & destructive interference causes waves with different phase angles to be eliminated except if they are multiples of each other
distance between
semi-reflective layers
order of interference
refractive index
of dielectric