A ray of light moving parallel to \( x \)-axis gets P reflected fro...

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A ray of light moving parallel to \( x \)-axis gets
P reflected from a parabolic mirror whose equation is

W \( 4(x+y)-y^{2}=0 \). After reflection the ray pass through the \( p t(a, b) \). Then the value of \( a+b \) is:
(1) 2
(2) 1
(3) -2
(4) -1
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