4/11/2023 0 Comments Angle of reflection experiment![]() ![]() NOTE: These rules are all about creating an imaginary (what people call virtual) image behind the mirror. The Law of Reflection states that when waves are reflected from an interface, the angle of incidence equals the angle of reflection. The angle of refraction is given by Snells Law: Where. Some very smart scientists set up ray diagram rules and these will be shown in the next section. When light crosses into a new medium, some of the light will refract (bend) and some of it will reflect. But why bother when there is a much easier method for finding these lines from a flat mirror? The above is a very time-consuming method for finding the projected rays from an object. If you removed the object and left the red arrow you wouldn't know that the object had been removed. If you could ask someone to paint, in red, where the arrow was on the plane mirror it would look like the above diagram. Now we have finally worked out how the light rays from an object focus into the eye of an observer. Now we have to carry out the same procedure from the bottom of the object to the observer. You can then draw the incident ray to the mirror and the reflected ray to the observer. Below you can see waves of light reflecting off a mirror. Light reflects from a mirror at the same angle as it arrives. When you see the image of your face in a mirror, you are seeing the reflection of light from your face. When the angle between the incident ray and the normal is equal to the angle between the reflected ray and the normal we can then mark a dot on the outside edge of the protractor where this occurs. Angles of Reflection When light strikes a mirror it bounces off. ![]() The angle between the incident ray and the normal is equal to the angle between the reflected ray and the normal. This uses the main law of reflection which states: Move the protractor up and down until you have the point of the object arrow (incident ray) and the observer (reflected ray) with an equal angle between these rays and the 90° mark on the protractor.Īs you can see, or hopefully as you have experimented, aligning the ruler, protractor and mirror and trying to work out an equal angle either side of the 90° on the protractor is difficult and time-consuming. ![]() Use a ruler to extend the protracted lines. Place a protractor with its straight edge along the plane mirror. In the following diagram we will try to find the light rays from an object which travel and focus in the eye of an observer: Here we shall discuss method 1, using the laws of reflection. When we observe an object in a mirror there are two ways to work out how the light rays from an object focus into the eye of an observer: ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |