For special applications the dispersion of the substrates becomes important. The two diagrams show the dispersion curves of four common substrate materials:For coatings with optimized dispersion properties see chapter “Dispersive coatings“.

Oh, dude, 3 mm is like 0.3 cm because there are 10 mm in 1 cm. So, if you want it in fractions, it's like 3/10. But hey, who's counting, right?

I'm wondering what the original, or book, question actually asks, but in this case, a it is a circle larger in radius, diameter and circumference by the ratio 4:3; and in area by the ratio 16:9.

In LOOP, the LASEROPTIK ONLINE PORTAL, you can search for coated optics available in our stock or configure your own ideas.