The path difference produced by two waves is 3.75 `mu`m and the wavelength is 5000 Å. The point is

Options

A. uncertain
B. dark
C. partially bright
D. bright

Answer

B

Explanation

Path difference `= n lambda`
`:.n=("Path diff")/(lambda)`
`=(3.75xx10^(-6))/(5xx10^(-7)) =(37.5)/(5)=7.5`
Path difference is equal to odd multiple of hal of wagvelength given is dark.