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
intensity reduced to 1/4 as compared
to intensity due to the direct beam
alone. The resultant intensity will be:
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Explanation:
I = I1 + I2 + 2√I1 I2 cosФ
Here Ф = 0
I = I + i/4 + 2 x i/2
= 9i /4