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  • (a) In Young's double-slit experiment, two slits are 1 mm apart and the screen is placed 1 m away from the sits. Calculate the fringe width when the light of wavelength 500 nm is used. (b) What should be the width of each slit in order to ob

(a) In Young's double-slit experiment, two slits are 1 mm apart and the screen is placed 1 m away from the sits. Calculate the fringe width when the light of wavelength 500 nm is used.
(b) What should be the width of each slit in order to obtain 10 maxima of the double slits pattern within the central maximum of the single slit pattern?

 

 

 

 
 
 
 
 

Answers (1)

a) Fring width

\beta =\frac{\lambda D}{d}

given, d= I mm

          D= I m

          \lambda =500 nm

\beta =\frac{500\times 10^{-9}\times 1}{1\times 10^{-3}}

     =500\; mm

     =5\times 10^{-4}m

b) given

\frac{2\lambda D}{a }=10\beta

 a=\frac{2\lambda D}{10\beta }

  =\frac{2\times 500\times 10^{-9}\times 1}{10\times 500\times 10^{-6}}

=0.2\times 10^{-3}m

a=0.2 \; mm

Posted by

Safeer PP

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