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In plane transmission grating, the angle of diffraction for second order maxima for wavelength 5 x 10 -5 cm is 30 0. Calculate the number of lines in one centimeter of the grating surface. A. 1000 lines/cm B. 5000 lines/cm C. 500 lines/cm D. 10000 lines/cm

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In plane transmission grating, the angle of diffraction for second order  maxima for wavelength 5 x 10 -5 cm is 30 0. Calculate the number of lines  in one centimeter of the grating surface.  
A. 1000 lines/cm  
B. 5000 lines/cm  
C. 500 lines/cm  
D. 10000 lines/cm
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B. 5000 lines/cm
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