Question

a. Antireflection coatings on glass (n = 1.50) are often made of thin films of MgF2 (n = 1.38) because it is durable and has an index between glass and air (n = 1.00). For a 500 nm thick film of MgF2 on glass, what is the longest wavelength (in nm) that will experience destructive interference on reflection? Please draw a picture with the reflections b. Visible light ranges from 400 nm to 700 nm wavelength. What is the only visible wavelength (in nm) that will experience destructive inteference on reflection? c. For that minimal reflection in the visible, how many waves (full cycles) does the light go through inside the film?

Answer 1

L.38 hm 2 2 920 nm

5 500 hm