An interference pattern is formed on a screen by shining a planar wave on a double-slit arrangement. If we cover one slit with a glass plate, the phases of the two emerging waves will be different because the wavelength is shorter in glass than in air. If the phase difference is 180^(@), how is the interference pattern altered?

An interference pattern is formed on a screen by shining a planar wave

1.	An interference pattern is formed on a screen by shining a planar wave on a double-slit arrangement. If we cover one slit with a glass plate, the phases of the two emerging waves will be different because the wavelength is shorter in glass than in air. If the phase difference is 180^(@), how is the interference pattern altered?
Answer» The pattern vanishes The bright spots lie CLOSER together The bright spots are FARTHER apart The pattern GETS SHIFTED in such a way that center of the screen is a dark band Answer :D

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