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A source emits electromagnetic waves of wavelength 3m. One beam reaches the observer directly and other after reflection from a water surface, travelling 1.5 m extra distance and with an intensity reduced to 1/4 as compared to intensity due to the direct beam alone. The resultant intensity will be.
(1/4) fold
(3/4) fold
(5/4) fold
(9/4) fold
D.
(9/4) fold
We know that a phase change of π occurs when the reflection takes place at the boundary of the denser medium. This is equivalent to a path difference of λ/2.
Therefore, Total phase difference = π -π = 0
Thus, the two waves superimpose in phase.
Resultant,
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