Q: Yellow light is used in a single slit diffraction experiment with slit width of 0.6 mm. If yellow light is replaced by X-rays, then the observed pattern will reveal
(A) that the central maximum is narrower
(B) more number of fringes
(C) less number of fringes
(D) no diffraction pattern
Sol: Diffraction is obtained when slit width is of order of wavelength of light used. The wavelength of X-rays (1 – 100 A°) << slit width (0.6 mm) . Hence no diffraction is observed .