The question has a paragraph followed by two statements, Statement 1 and Statement 2. Of the given four alternatives after the statements, choose the one that best describes the statements.
A thin air film is formed by putting the convex surface of a plane convex lens over a plane glass plate. With monochromatic light, this film gives an interference pattern due to light reflected from the top (convex) surface and the bottom (glass plate) surface of the film.
Statement 1 : When light reflects from the air-glass plate interface, the reflected wave suffers a phase change of $π$ .
Statement 2 : The center of the interference pattern is dark.

Statement 1 is True, Statement 2 is False.

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Statement 1 is True, Statement 2 is True; Statement 2 is a correct explanation for Statement 1.

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Statement 1 is True, Statement 2 is True; Statement 2 is not the correct explanation for Statement 1.

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Statement 1 is False, Statement 2 is True.

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Solution

The correct option is B Statement 1 is True, Statement 2 is True; Statement 2 is a correct explanation for Statement 1.
As light enters from glass to air it suffers a phase change on $π$ and therefore at centre there will be destructive interference.

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Q. Direction:
The question has a paragraph followed by two statements, Statement-1 and Statement-2. Of the given four alternatives after the statements, choose the one that describes the statements.
A thin air film is formed by putting the convex surface of a plane-convex lens over a plane glass plate.
With monochromatic light, this film gives an interference pattern due to light reflected from the top (convex) surface and the bottom (glass plate) surface of the film.
Statement -1 : When light reflects from the air-glass plate interface, the reflected wave suffers a wave change of

π

Statement-2: The centre of the interference pattern is dark

STATEMENT-1 : Two coherent point sources of light having nonzero phase difference are seperated by small distance. Then on the perpendicular bisector of line segment joining both the point sources, constructive interference cannot be obtained.
STATEMENT-2 : For two waves from coherent point sources to interfere constructively at a point, the magnitude of their phase difference at that point must be $2 m π$ ( where m is a nonnegative integer).

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