Yellow light is used in a single slit diffraction experiment with slit width of 0.6 mm…

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

Ans: (D)

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 .