Question

In A Young’S Two Slit Experiment With Monochromatic Light, Fringes Are Obtained On A Screen Placed At Some Distance From The Plane Of Slits. If The Screen Is Moved By Towards The Slits, The Change In Fringe Width Is . If The Distance Between The Slits Is , Calculate The Wavelength Of The Light Used.

Answer 1

Explanation:

PHYSICS

Fringe width β =

dλD

Where D is the distance between slit and the screen, d is the distance between two slits, λ is the wavelength of light.

∴Δβ =

d

λΔD

or, λ =

ΔD

Δβd

or, λ=

5×10

−2

10

−3

×(3×10

−5

)

= 0.6×10

−6

=6000

A

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