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Q. What is Fraunhofer diffraction?
a) The source as well as the screen are at infinite distances from the obstacle producing diffraction.
b) The wave front suffer diffraction is plane.
c) The diffracted rays that are parallel to one another are brought to focus with the help of a convex lens.
A glass sphere of radius 15 cm has a small air bubble at a distance of 6 cm from its centre. When viewed normally along its diameter from the nearest side, the bubble seems to be 7
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