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(A) For the intensity of reflected light to be minimum,the light must be incident at the polarizing angle $(i_p)$ (Brewster's angle).According to Brew

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$120$

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(A) For the intensity of reflected light to be minimum,the light must be incident at the polarizing angle $(i_p)$ (Brewster's angle).According to Brewster's law,$	an i_p = \mu = \frac{4}{3}$.Let the point of reflection on the river surface be at a distance $d_1$ from the base of the building and $d_2$ from the base of the tower.The total width of the river is $W = d_1 + d_2$.From the geometry of the problem:$	an i_p = \frac{d_1}{30} = \frac{4}{3} \Rightarrow d_1 = 30 	imes \frac{4}{3} = 40 \, m$.$	an i_p = \frac{d_2}{60} = \frac{4}{3} \Rightarrow d_2 = 60 	imes \frac{4}{3} = 80 \, m$.Therefore,the width of the river is $W = d_1 + d_2 = 40 + 80 = 120 \, m$.

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