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In a biprism experiment d=1mm. Interfere...

In a biprism experiment d=1mm. Interference fringes of width X=2.25 mm are observed on a screen at a distance of 3 m from the plane of the slit. The wavelength of incident light lies in the ____region.

A

green

B

yellow

C

red

D

violet

Text Solution

Verified by Experts

The correct Answer is:
C
`lamda=(Xd)/(D)=(2.25xx10^(-3)xx10^(-3))/(3)`
`=7.5xx10^(-7)m=7500` Å
this lies the red region of the visible spectrum.
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