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NEET UG PHYSICS MCQ: WAVE OPTICS
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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 I : When light reflects from the air-glass plate interface, the reflected wave suffers a phase change of .
Statement II : The centre of the interference pattern is dark.
Statement I : When light reflects from the air-glass plate interface, the reflected wave suffers a phase change of .
Statement II : The centre of the interference pattern is dark.
View answer and explanation
Correct option: B
Statement I is true, Statement II is true; Statement II is not the correct explanation for Statement I
Option B is correct. Statement I is true because light reflecting from a denser medium (air-glass) undergoes a phase change of . Statement II is also true because the center is dark due to this phase change, but the phase change is not the explanation for statement I itself.
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