JEE PHYSICS MCQ: WAVE OPTICS

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Application +4 | -1

In the ideal double-slit experiment, when a glass-plate (refractive index 1.5) of thickness

t

is introduced in the path of one of the interfering beams (wave-length

\lambda

), the intensity at the position where the central maximum occurred previously remains unchanged. The minimum thickness of the glass-plate is -

View answer and explanation

Correct option: A

2 \lambda

Option A (

2 \lambda

) is correct because the path difference introduced by the glass plate must be an integer multiple of the wavelength to maintain the central maximum.

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