White light may be considered to be mixture of waves of `lambda` ranging between `3900 Å` and
Channel: Doubtnut
Date: 2020-08-16

White light may be considered to be mixture of waves of `lambda` ranging between `3900 Å` and `7800 Å`. An oil film of thickness `10,000 Å` is examined normally by the reflected light. If `mu=1.4`, then the film appears bright for