Wave Optics

The film appears bright if the path difference is

2%20%5Cmu%20t%20%5Ccos%20r%3D(2%20n-1)%20%5Cfrac%7B%5Clambda%7D%7B2%7D

n%3D1%2C2%2C3%2C%20%5Cldots

%5Ctherefore%20%5Clambda%3D%5Cfrac%7B4%20%5Cmu%20t%20%5Ccos%20r%7D%7B(2%20n-1)%7D

%5Clambda%3D%5Cfrac%7B4%20%5Ctimes%201.4%20%5Ctimes%2010000%20%5Ctimes%2010%5E%7B-10%7D%20%5Ccos%200%5E%7B%5Ccirc%7D%7D%7B(2%20n-1)%7D

%3D%5Cfrac%7B56000%7D%7B(2%20n-1)%7D%20%5C%2C%3F

%5Ctherefore%20%5Clambda%3D56000%20%5C%2C%3F%2C%2018666%20%5C%2C%3F%2C%2011200%20%5C%2C%3F%2C%208000%20%5C%2C%3F

6222%20%5C%2C%3F%2C%205091%20%5C%2C%3F%2C%204308%20%5C%2C%3F%2C%203733%20%5C%2C%3F

The wavelengths which are not within specified ranges are to be rejected.

Chapter Questions
1 MCQs