A source emits electromagnetic waves of wavelength `3 m`. One beam
Channel: Doubtnut
Date: 2020-08-02

A source emits electromagnetic waves of wavelength `3 m`. One beam reaches the observer directly and other after reflection from a watersurface, 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 :