Задача 40782.

Determine the smallest thickness d and refractive index n2 of the surface layer on glass (n3 = 1,5), which minimizes the reflection light beams (lambda = 500 nm), normally incident from the air (n1 = 1,0). Note: The intensity of the rays reflected from the upper and lower boundaries of the layer, to consider the same.

Detailed solution with a short recording conditions, laws and formulas used in the decision, the withdrawal of the calculation formula and the answer.
If you have any questions about the decision to write. I try to help.