Application
22/31
Optical characteristics at interfaces Optical light path difference
= n (AB + BC) - n AD
2
1
Incident angle = Reflection angle
d
AB = BC = cos2
Trigonometric analysis
= 2n d cos
2
2
When two lights are in-phase
2n d cos = m
2
2
When two lights are out-of-phase
2n d cos
1
= (m - )
2
2
2

---