Equation of a plane progressive wave is given by y=0.6 sin2πt-x2. On reflection from a denser medium, its amplitude becomes 23rd of the amplitude of the incident wave. The equation of the reflected wave is:
1. y=0.6 sin2πt+x2
2. y=-0.4 sin2πt+x2
3. y=0.4 sin2πt+x2
4. y=-0.4 sin2πt-x2
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