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Comprehension # 'A ray M is sent along ...

Comprehension # 'A ray `M` is sent along the line `(x-0)/2=(y-2)/2=(z-1)/0` and is reflected by the plane `x=0` at point `Adot` The reflected ray is again reflected by the plane `x+2y=0` at point `Bdot` The initial ray and final reflected ray meets at point `Jdot` The coordinate of the point `B` is

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