posted by Liz .
light travelling in air is incident on a soap bubble. If the path difference through the soap bubble is 2.5λ:
a) constructive interference will occur
b) destructive interference will occur
c) partial interference will occur
d) none of the above
Would the answer be a?
upon reflection on the inner surface, another 180deg shift occurs, so the path lenght is 3.0 wavelength, so it is constructive interference.