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Physics-

General

Easy

Question

A point source is emitting light of wavelength 6000 $text Å end text$ isplaced at a very small height h above a flat reflecting surfaceMNasshowninthefigure.

The intensity of the reflectedlight is 36% of the incidentintensity.Interference fringes are observed on a screenplacedparalleltothereflectingsurfaceataverylargedistanceD from it. Theshapeoftheinterferencefringesonthescreenis

circle
ellipse
parabola
straightline

The correct answer is: circle

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