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10. Wave optics — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics10. Wave optics1 Mark
MCQ
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
  • A
    That the central maxima is narrower
  • ✓
    No diffraction pattern
  • C
    More number of fringes
  • D
    Less number of fringes
✓

Answer

Correct option: B.
No diffraction pattern
b
(b)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.

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