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Equation of a plane progressive wave is given by
\( \mathrm{P} \) \( y=0.6 \sin 2 \pi\left(t-\frac{x}{2}\right) \). On reflection from a denser medium

W its amplitude becomes \( \frac{2}{3} \) of the amplitude of the incident wave. The equation of the reflected wave is
[NCERT Exemplar]
(a) \( y=0.6 \sin 2 \pi\left(t+\frac{x}{2}\right) \)
(b) \( y=-0.4 \sin 2 \pi\left(t+\frac{x}{2}\right) \)
(c) \( y=0.4 \sin 2 \pi\left(t+\frac{x}{2}\right) \)
(d) \( y=-0.4 \sin 2 \pi\left(t-\frac{x}{2}\right) \)
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