Question

In a biprism experimentn the distance between second and eight dark fringes on the same side of central bright fringe is 3 mm. The fringe width is
A. 1 mm
B. `0.5` mm
C. `1.5 mm`
D. 2 mm

Answer 1

Correct Answer - B
`x_(8)-x_(2)=3 " "[ :.x_(n)=(2n-1) beta//2]`
`:. 7.5 beta-1.5 beta=3`
`:. beta=(3)/(6)=0.5 mm`