Processing math: 100%

λ=bsinθ=bsinϕ2

b=λsinϕ2

ϕ=300, b=550nmsin3002=2.125μm

ϕ=450, b=550nmsin4502=1.437μm

ϕ=900, b=550nmsin9002=0.778μm

ϕ=1800, b=550nmsin18002=0.55μm