- #1
BananaMan
- 40
- 0
heres the question:
anti-reflection coatings on a glass lens (n=1.50) consists of a magnesium fluoride (n=1.38) film, the coating thickness is chosen to eliminate any back reflectionusing the ideas of destructive interference. What is the minimum coating thickness required to eliminate the reflection from a helium-neon laser at 632.8nm? Should the coating be the same thickness on both the front and rear faces of the lens?
really don't have a clue where to go with this one, looked all through my notes for this and can't find anything on coatings, if someone could just point me in the right direction i should be able to do it? thanks
anti-reflection coatings on a glass lens (n=1.50) consists of a magnesium fluoride (n=1.38) film, the coating thickness is chosen to eliminate any back reflectionusing the ideas of destructive interference. What is the minimum coating thickness required to eliminate the reflection from a helium-neon laser at 632.8nm? Should the coating be the same thickness on both the front and rear faces of the lens?
really don't have a clue where to go with this one, looked all through my notes for this and can't find anything on coatings, if someone could just point me in the right direction i should be able to do it? thanks