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I was trying problem 1.6 and couldn't solve it. Any help is appreciated.

My effort : I considered a point $P_1$ at distance y from the x-axis and another point $P_2$at a distance $y-\delta y$ from the x-axis, but lying on the same wavelet. Then in small time $\tau$, the point $P_1$ and $P_2$ produce a wavelet of radius $R_1= \frac{c \tau}{n(y)}$ and $R_2= \frac{c \tau}{n(y-\delta y)}$. But I couldn't related this radii to the radius of wavelet.

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