Diffraction is bending and spreading of light waves at the edge of an opening.
A diffraction effect for electromagnetic waves becomes significant when
a) the size of the obstacle is less than the wavelength of the EM wave
b) the size of the obstacle is greater than the wavelength of the EM wave
c) the color of the light diffracted on the obstacle is violet
d) the color of the light diffracted on the obstacle is red
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