Hello!

I’m looking for the angle of incidence of the HD-DVD optical system.

I know the formula to calculate the numeric aperture:

NA = n * sin(u)

n is the refractive index and u the angle of incidence. We all know, that the NA of HD-DVD is 0.65. The refractive index is 1.62. So I could change the equation to

NA/n = sin(u)

0.65/1.62 = sin(u)

But my mathematics lessons are really to long ago, so I don’t know how to depatch the equation. By using a loop to solve the problem by testing, I get different results for u, where the NA is 0.65 and the refractive index is 1.62.

Can anyone help me?

Bye

Michael