What angle should you rotate a mirror so that a reflected ray rotates through 28 degrees.
I got 20, but i am not sure, please help
Why 20?
If you are facing the mirror, how much do you need to turn the mirror to see things on the left? Go to the bathroom and give it a try.
The same ratio works for 28°.
To determine the angle at which a mirror should be rotated for a reflected ray to rotate through a certain angle, you need to understand the concept of the law of reflection.
The law of reflection states that the angle of incidence (incoming ray) is equal to the angle of reflection (reflected ray) when light strikes a mirror or any other reflective surface.
In this case, you want the reflected ray to rotate through 28 degrees.
Since the incident angle and reflected angle are the same, you need to rotate the mirror by half the desired angle. Divide 28 degrees by 2 to get 14 degrees.
Therefore, to rotate the mirror so that the reflected ray rotates through 28 degrees, the mirror should be rotated by 14 degrees.