Question

The Fraunhofer diffraction pattern of a slit of width 0.08 mm is formed on a screen by keeping a convex lens of focal length 75 cm just behind the slit. If the first dark band is formed at a distance of 5.625 mm from the centre of the diffraction pattern on the screen, find the wavelength of light used.​

Answer 1

Explanation:

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Answer 2

Answer:

The wavelength of light used is 0.0106m

Explanation:

Given :-

wavelength (λ) = 0.08mm = 0.08×$10^{-3}$m

focal length (f) = 75cm = 0.75m

n = 1

distance (d) = 5.625mm = 5.625×$10^{-3}$m

we know,

nλ = dy/f

λ = dy/fn

λ = 0.08×$10^{-3}$ × 0.75/5.625 × $10^{-3}$ × 1

λ = 0.0106m