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In an experiment to observe interference of light waves a double slit is placed close to the source. See fig 3.

(i) State the function of the double slit.
(ii) Describe what is observed on the screen.
(iii) State what is observed on the screen when
I. The slit separation #S_1S_2# is reduced.
II. White light source is used in placed of monochromatic source.

Answer Text:
i)- Double slit provides coherent sources.
ii)- Alternate dark and bright fringes are absorbed. With central fringe being brightest while intensity of other fringes reduces away from fringe.
iii)
I.- The separation of fringes increases
II.-- Central fringe is white, fringes on either side are coloured.