In a Biprism experiment, the slit separation is 1mm. Using monochromatic light of wavelength 5000 Å, an interference patternn is obtained on a screen. For changing the bond width by `2.5xx10^(-5)`m.

Options

A. the screen is moved away from the slits by 10 cm
B. the screen is moved towards the slits by 10 cm
C. the screen is moved away or towards the slits by 5 cm
D. the screen is moved away or towards the slits by 10 cm

Answer

C

Explanation

`X=(lamdaD)/(d)" "therefore DeltaX=(lamda(DeltaD))/(d)`
`therefore DeltaD=(d(Deltax))/(lamda)`
`=(10^(-3)xx2.5xxx10^(-5))/(5xx10^(-7))=1/(20)m=5cm`