Anti-reflective coatings

Question 1

What is the equation for reflectance?

Answer 1

~ R = [(nair-nglass)/(nair+nglass)]^2

Question 2

How do you eliminate reflection?

Answer 2

~ apply a (typically polymeric) film of thickness λ/4

Question 3

When does complete annihilation of reflectiveness occur?

Answer 3

when the intensities are matched

Question 4

When are intensities matched?

Answer 4

~ when Rcoating = Rglass: ncoating = sqrt(nair*nglass)