What is the necessary condition for the diffraction of waves through an obstacle (or object)? A. The obstacle should have a reflecting surface. B. The waves should have high frequency. C. The wavelength of the waves should be comparable with the size of the object. D. The waves should have a constructive interference, What is the advantage of a diffraction grating over a double slit? A. Diffraction grating has more slits B. Diffraction grating produces much intense and sharper pattern than the double slit. C. Diffraction grating is compact and easy to use. D. For diffraction grating, light need not be coherent or monochromatic to form pattern.

What is the necessary condition for the diffraction of waves through an obstacle (or object)? A. The obstacle should have a reflecting surface. B. The waves should have high frequency. C. The wavelength of the waves should be comparable with the size of the object. D. The waves should have a constructive interference, What is the advantage of a diffraction grating over a double slit? A. Diffraction grating has more slits B. Diffraction grating produces much intense and sharper pattern than the double slit. C. Diffraction grating is compact and easy to use. D. For diffraction grating, light need not be coherent or monochromatic to form pattern.