In a double 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 5×10⁻² m towards the slits, the change in fringe width is 3×10⁻³ cm. If the distance between the slits is 1 mm, then the wavelength of th…

Question

In a double 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 5×10⁻² m towards the slits, the change in fringe width is 3×10⁻³ cm. If the distance between the slits is 1 mm, then the wavelength of the light will be nm.

Accepted Answer

600. β = (λ D)/d ⇒ Δβ = (λ Δ D)/d. λ = (d Δβ)/(Δ D) = (10⁻³×3×10⁻⁵)/(5×10⁻²) = 6×10⁻⁷ m. λ = 600 nm. → 600

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