Answer to Question #113466 in Optics for Hayley

Question #113466
Geraldine uses a 439-nm coherent light source and a double slit with a slit separation of 26.0 μm to display three interference maxima on a screen that is 20.0 cm wide. If she wants to spread the three bright fringes across the full width of the screen, from a minimum on one side to a minimum on the other side, how far from the screen should she place the double slit?
1
Expert's answer
2020-05-04T12:44:18-0400

As per the given question,

wavelength of the wave (λ)=439nm(\lambda)=439nm

separation between the slit (d)=26μm(d)=26\mu m

width of the interference maxima =20.0 cm

Hence 20/2=10cm20/2=10cm

total number of interference maxima (m)=3

Let the initial distance between the slit and the screen is D

now, we know that y=mλDdy=\dfrac{m\lambda D}{d}

D=ydmλ=10×102×26×1063×439×109=1.97m2mD=\dfrac{yd}{m\lambda}=\dfrac{10\times 10^{-2}\times 26\times 10^{-6}}{3\times 439\times10^{-9}}=1.97m \simeq 2m

Now, for the second case y=20,

m=3

(d)=26μm(d)=26\mu m

D=ydmλ=20×102×26×1063×439×109=3.95m4mD=\dfrac{yd}{m\lambda}=\dfrac{20\times 10^{-2}\times 26\times 10^{-6}}{3\times 439\times10^{-9}}=3.95m \simeq 4m


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