Question

The distance of 10 dark band from centre of interference pattern is 28.5 mm. The bandwidth is.....

Answer 1

Answer:

2.85m

Explanation:

Band width,beta = lambda* D/d

But for dark band,

y = {(2m - 1)/2}*lambda*D/d = (19/2)beta

28.5 =19/2beta

Beta = 3mm

Band width is 3mm