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12th Class Physics Wave Optics / तरंग प्रकाशिकी

  • question_answer 19)
    A parallel beam of light of wavelength 500nm falls on a narrow slit and the resultingdiffraction pattern is observed on a screen1 m away. It is observed that the first minimum is at a distance of 2.5 mm fromthe centre of the screen. Find the width ofthe slit. 

    Answer:

    first minimum But  


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