00:01
For part a of our question, we're asked to determine the distance the reflected light beam travels before striking the mirror.
00:06
So if you look at figure 22 .8, you see that the distance from point o to point b is equal to 1 .25 meters, and this angle here, theta, is equal to 50 degrees.
00:16
So the distance from o to o prime, which we call d .o to o prime, can be found using the trigonometric identity, where the cosine of the angle, theta, is equal to the adjacent.
00:35
So o to b over the hypotenuse, which is what we want to find o to o prime.
00:44
So this is part a.
00:45
Let's go ahead and indicate that.
00:48
So solving for the distance from o to o prime, we find that this is equal to the distance from o to b divided by the cosine of the angle data, which is the incident angle...