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12th Class Physics Wave Optics / तरंग प्रकाशिकी

  • question_answer 18)
    TWO towers on top of two hills are 40 kmapart. The line joining them passes50 m above a hill halfway between the towers. What is the longest wavelength of radiowaves, which can be sent between the towerswithout appreciable diffraction effects ?  

    Answer:

    If A and B are two hills and C is the hillpeak mid way. Then, using the diffractioncondition, orFor longest wavelength n = 1 and or  


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