Question

Yellow light is used in single slit diffraction experiment with slit width 0.6 mm. If yellow light is replaced by X-rays then the pattern will reveal

[IIT-JEE (Screening) 1999; MP PMT 2002; KCET 2003]

• A. That the central maxima is narrower
• B. No diffraction pattern
• C. More number of fringes
• D. Less number of fringes

Answer 1

The correct option is B

No diffraction pattern

Diffraction is obtained when the slit width is of the order of wavelength of EM waves (or light). Here wavelength of X-rays (1-100 Å) is very-very lesser than slit width (0.6 mm). Therefore no diffraction pattern will be observed.