A) dispersion
B) diffraction
C) interference
D) refraction
Correct Answer: B
Solution :
Diffraction is the process of bending and spreading of waves when they meet an obstruction. Also diffraction grating is a reflecting or transparent substance whose surface contains fine parallel grooves or rulings that are equally spaced. When light is incident on grating coloured pattern are formed due to diffraction. When a compact disc is illuminated, then coloured lines are observed because as one surface of the CD has many small pits in the plastic, arranged with concentric rings, that surface has a thin layer of metal applied to make the pits more visible. These pits function as diffraction gratings.
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