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Equation of a plane progressive wave is given by y =0.6sin2π(t-x/2) . On reflection from a denser medium its amplitude becomes 2/3 of the amplitude of the incident wave. The equation of the reflected wave is

(a)  y =0.6sin2π(t+x/2)

(b) y=-0.4sin2π(t+x/2)

(c) y=0.4sin2π(t+x/2)

(d) y=-0.4sin2π(t-c/2)

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(d) y=-0.4sin2π(t-c/2)

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