1.9 Diffraction of waves
(a) Diffraction is the spreading of wave round sharp edges when the wave encounters a small opening or small obstacle.
(b) Diffraction grating is a piece of transparent material with many parallel lines marked on it. The spaces between two lines act as slits. Diffraction occurs as light pass through the slits.
(c) Diffraction pattern.
The diffraction pattern is produced by a combination of diffraction and interference effect.
(d) Diffraction grating formula
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