24.2 Thin Film Interference
Thin Film Interference
| THIN FILM INTERFERENCE | ||
|---|---|---|
| WITH RELATIVE PHASE SHIFT | ||
| ConstructiveInterference | 2t = (m + ½) λfilm | m = 0, 1, 2 ... t = thickness λfilm = wavelength in the film λfilm = λvacuum / n |
| DestructiveInterference | 2t = mλfilm | |
| WITHOUT RELATIVE PHASE SHIFT | ||
| ConstructiveInterference | 2t = mλfilm | m = 0, 1, 2 ... t = thickness λfilm = wavelength in the film λfilm = λvacuum / n |
| DestructiveInterference | 2t = (m + ½) λfilm | |
• Reflected rays are inverted when going from a smaller to larger index of refraction.