In a biprism experiment, the distance between the consecutive bright bands is 0.32 mm, when red light of wavelength 6400 Å is used. By how much would the band width change, if blue light of wavelenth 4800 Å is used, with the same setting?

Options

A. 0.02 mm
B. 0.04 mm
C. 0.06 mm
D. 0.08 mm

Answer

D

Explanation

`(X_(R))/(X_(B))=(lamda_(a))/(lamda_(B))=(4)/(3)" "(0.32)/(X_(B))=(4)/(3)`
`therefore X_(B)=0.24mm` `therefore dX=0.32-0.24=0.08mm`