A plane wave $y=A\,\, sin\,\, \omega \left( {t - \frac{x}{v}} \right)$ undergo a normal incidence on a plane boundary separating medium $M_1$ and $M_2$ and splits into a reflected and transmitted wave having speeds $v_1$ and $v_2$ then
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Amplitude of reflected wave $A_r=\frac{v_2-v_1}{v_1+v_2} A_i$
Amplitude of transmitted wave $A_t=\frac{2 v_2}{v_1+v_2} A_i$
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