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Single-colour light falling on two slits 0.040mm apart produces the fifth-order dark fringe at a 4.0​o​...

Single-colour light falling on two slits 0.040mm apart produces the fifth-order dark fringe at a 4.0​o​ angle. Calculate the wavelength of the light.

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Answer #1

The position of nth dark fringe from the central maximum is given by

  

  

Thus, the wavelength of the light

  

  

Therefore, the wavelength of the light is

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