Consider the following statements A and B and identify the correct answer.
A) In the case of narrow source of light coherent sources are obtained by the division of wave front
B) Diffraction is due to interference of light from secondary sources of the same wave front whereas interference is due to superposition of two waves derived from the same source

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A is false but B is true

A is true but B is false

Both A and B are true

Both A and B are false

answer is C.

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Detailed Solution

Division of Wavefront: Under this category, the coherent sources are obtained by dividing the wavefront, 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.

We know that two separate wave front originating from two whereas sources produce interference.
Secondary wavelets originating from different parts of same wave front constitute diffraction.

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