Alight ray strikes a plane mirror at an angle of 20 degrees to the normal. what is the angle of the reflected light ray to the normal?

40 degrees
70 degrees
0 degrees
20 degrees

20 degrees

Explanation:

According to the Law of Reflection, when a ray of light strikes a surface, the angle of this ray (incident ray) with respect to the normal of the surface is equal to the angle that forms the reflected ray with the same normal of the surface.  

In other words:  

Both the incident ray and the reflected ray and the normal to the surface are in the same plane, in addition, the angle of the incident ray is equal to the angle of the reflected ray.  

In this context, when a ray strikes the surface of a plane mirror, both the incident angle and the reflected angle will be the same.

it about 600 mph from what i calculated

hello, i am papaguy.

i have found an answer to your question but use it as information.

information: because weak acids/bases have low concentration of hydrogen ions, the addition of water has a large impact on the ph. 2. a difference in 1 unit is a 10x difference in concentration for example; a liquid with ph of 3 is 10x more acidic than a liquid with a ph of 4. therefore, a liquid with a ph of 3 is stronger.

best of luck!