Originally Posted by mgb_phys
Nearly, the rules change if the first medium is higher than the second - there is no phase change so there is no 1/2 in the equation. Optics isn't always easy ;-(
The other pages on the link I gave you explains it further.
Ok, so when light reflects off a surface with a higher index of refraction, it gains an extra shift of half of a wavelength. Therefore: 2ndcosbeta=(m)lamda?
is cosbeta = 1 still?
then why am i not getting the right answer when i solve for d??