00:01
So in this picture are two mirrors that are parallel to each other.
00:07
So at this angle, they reach at a right angle.
00:12
And the question asked to find the distance the reflected light beam travels before striking mirror 2 and to find what direction does the light beam travel after being reflected from mirror 2.
00:28
After the beam strikes a mirror run, it will bounce to mirror 2.
00:38
And from mirror 2, it will bounce somewhere this way.
00:44
And what we're finding is essentially the length of the beam, let's say deep.
00:55
And we're finding the direction of the light beam.
01:00
And in this case, the direction, this light beam will strike, so we can just find what that angle is.
01:08
So for part a, finding the distance of the reflective light beam before it strikes mirror 2, we know that the 40 degree angle on a 90 degree angle on a 90, at 90 degrees would mean that this angle would have to be 50 degrees.
01:33
This also means that this angle has to be 50 degrees.
01:39
We also know that from this point to the mirror is 1 .25 meters...