Here's the question you clicked on:
robinfr93
a ray of light has an equation x + y =1. If the angles between the incident ray and normal and the reflected ray and normal are equal, then find the equation of the reflected ray.
y=-x+1 then -1 is the slop angle is tan inverse of -1 which is 135 hence the angle between the indecent ray and the normal is 45 degree hence the angle between the reflected ray and the normal is also 45 degree now try solving
Is the answer -x+y = 1??
yes u can check it by drawing the graph