DAY 17 – DAW January

Fraunhofer diffraction-single slit, double slit, diffraction grating, resolving power; Diffraction by a circular aperture and the Airy pattern;


Q 1. Can D1 and D2 lines of sodium light be resolved in second-order spectrum if the number of lines in the given grating is 450? Explain.  λD1=5890A0\lambda_{D1}=5890 A^0 and  λD1=5890A0\lambda_{D1}=5890 A^0. [10 marks]

Q 2. Discuss the phenomena of Fraunhofer diffraction at single slit and how that the intensities of successive maxima are nearly in the ratio of 1:49π2:425π2:449π21:\frac4{9\pi^2}:\frac4{25\pi^2}:\frac4{49\pi^2} .[20 marks]

Video Solution at 11 pm