In a young's double slit experiment with monochromatic light, fringes are obtained on a screen placed at some distance from the slits. If the screen is moved 8 cm towards the slits, the change in fringe width is 4 × 10-5 m. If the separation between the slits is 1 mm, find the wavelength of light used (in nm ).
In a young's double slit experiment with monochromatic light, fringes are obtained on a screen placed at some distance from the slits. If the screen is moved 8 cm towards the slits, the change in fringe width is 4 × 10-5 m. If the separation between the slits is 1 mm, find the wavelength of light used (in nm ).
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1 Answer
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β = (λD/d) ⇒ Δβ = (ΔDλ/d) ⇒ 4 × 10? = (λ/10? ³) × 8 × 10? ² ⇒ λ = 5 × 10? m = 500 nm
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