1) true
2) out of phase (light hits a more rigid medium)
3) in phase (ray 3 is a continuation of ray 1)
4) in phase (light hits a less rigid medium)
5) in phase (ray 5 is a continuation of ray 4)
6) in phase (2t = ½λ)
7)
l
lmedium =
8)
air
nmedium
2t = ½(329)
lmedium
490 = 329 nm
=
1.49
82.2 nm
9) a) reflects out of phase
b) reflects in phase (must reflect off vacuum)
10) a) 206 nm; b) 103 nm