So OA=2, BH=3, OH=5,
Because the angle 1= angle 2=45 degrees,
So OC=OA=2, CH=BH=3,
So from the Pythagorean theorem:
The radical number 2 of AC=2, the radical number 2 of BC=3,
Therefore, the path length of this beam of light from point A to point B is: 5 and 3.