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 forA. `4000 Å, 4667 Å, 5600 Å, 7000 Å`B. `4308 Å, 5091 Å, 6222 Å`C. `4000 Å, 5091 Å, 5600 Å`D. `4667 Å, 6222 Å, 7000 Å`

White light may be considered to be mixture of waves of `lambda` rangi

1.	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 forA. `4000 Å, 4667 Å, 5600 Å, 7000 Å`B. `4308 Å, 5091 Å, 6222 Å`C. `4000 Å, 5091 Å, 5600 Å`D. `4667 Å, 6222 Å, 7000 Å`
Answer» Correct Answer - B `2 mut-lambda/2=nlambda` `2mut=(n+1//2)lambda` `lambda=(2mut)/(n+1//2)=(2xx1.4xx10000)/(n+1//2)=28000/(n+1//2)` `n=0, lambda=56000 Å` `n=1, lambda=15333 Å` `n=2, lambda=11200 Å` `n=3, lambda=8000 Å` `n=4, lambda=6222 Å` `n=5, lambda=5091 Å` `n=6, lambda=4308 Å` ` lambda=4308 Å, 5091 Å, 6222 Å`

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