With the aid of a diagram, describe how interference can be produced by division of wave front.

With the aid of a diagram, describe how interference can be produced by division of wave front.

S, S₁ and S₂ are narrow slits parallel to each other. S diffracts light that falls on it and also illuminates both S₁ and S₂.

Diffraction also takes place at S₁ and S₂ and interference occurs in the region where light from S₁ overlaps that from S₂.

Since S is narrow, the light which emerges from S₁ and s₂ comes from the same wave front from S and thus coherent.

NB: The coherent sources are obtained by dividing the wave front, originating from a common source, by employing mirrors, biprisms or lenses. This class of interference requires essentially a point source or a narrow slit source.

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