A ray emanating from the point \( (0,6) \) is incident on
\( \mathr... VIDEO
A ray emanating from the point \( (0,6) \) is incident on
\( \mathrm{P}^{17} \) the ellipse \( 25 x^{2}+16 y^{2}=1600 \) at the point \( P \) with
W ordinate 5. After reflection, ray cuts the \( y \)-axis at \( B \) then the length of \( P B \) is
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