Answer the following questions:

Answer the following questions:
(i) In what way is diffraction from each slit related to the interference pattern in a double slit experiment ?
(ii) When a tiny circular obstacle is placed in the path
of light from a distant source, a bright spot is seen at the centre of the shadow of the obstacle. Explain, why.

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(i) Relation between diffraction from each slit to the interference pattern in a double slit experiment:
(a) If slit width in interference pattern is reduced
to the size of wavelength of light used; the diffraction will also takes place along with interference.
(b) The diffraction pattern is itself due to the
interference of wavelength belonging to same.
(ii) Waves diffracted from the edge of the circular obstacle interfere constructively at the centre of the shadow producing a bright spot.

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