Reflection around normal with radians
I need to reflect an incidence vector around a normal. The hypotenuse of the incidence vector is a fixed value, and I have the radian value of the angle it takes. I also have the length of the normal, and the corresponding radian value. Is there a way I can calculate the refraction vector in radians? A friend told me I could use , but this does not produce the correct results.
Thanks in advance for your help.
Apologies if I am being unclear. I have an object with speed 'x', traveling at angle ø. It collides with the internal edge of a circle at position (y, z). The normal is then, therefore, . How can I then find out the resultant vector if the object is to 'bounce' off this point?