Thin-film interference: constructive (maximum)
$$2\cdot h\cdot n\cdot cos(\beta) = \frac{(2\cdot k+1)\cdot \lambda}{2}$$
h - film thickness
n - refraction index
β - refraction angle
λ - wave length
n - refraction index
β - refraction angle
λ - wave length
Find
It is known that:
= 