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It describes the phase correlation of light waves across a wavefront.
Laser light has high spatial coherence, while ordinary light sources have poor coherence.
They undergo a phase change of π.
2μt cosr + λ/2 = nλ.
It is given by ∆ = 2μt cosr.
The film appears completely dark due to destructive interference.
Only certain wavelengths satisfy the condition for maxima and are reflected.
It is ∆eff = 2μt cosr + λ/2.
They are complementary; maxima in reflected light are minima in transmitted light.
Approximately 10^-4 seconds.