KCET 2008 Physics Solved Paper

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Question : 7 of 60

Marks: +1, -0

In Young's double slit experiment, a third slit is made in between the double slits. Then

intensity of fringes totally disappears.
only bright light is observed on the screen.
fringes of unequal width are formed.
contrast between bright and dark fringes is reduced.

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