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Consider a plane mirror P1 having equati...

Consider a plane mirror `P_1` having equation as `z=0`. A ray of light emerging from the point `P(1,2,3)` and travelled along the line `(x-1)/3=(y-2)/2=(z-3)/1` get reflected from the plane mirror `P_1` and the reflected line is denoted by `L_2`. The equation of the line `L_2,` is

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