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calculate the reflective vector

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[attachment=33620:??1.PNG]

The vector I and n are given, n is the unit vector, the output is vector r.

my question is the orientation of r.

Since dot(n,l) is the signed length(negative in this case) ,why the vector below n still multiply by "n",  and why the vector dot(n,l)*n and "n" have opposite orientations.

[attachment=33619:??.PNG] 

In my opinion ,it should be

[attachment=33621:??1q.PNG]

 

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