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- In the diagram, the ray of light approaching the mirror is known as the incident ray (labeled I in the diagram). The ray of light that leaves the mirror is known as the reflected ray (labeled R in the diagram).
www.physicsclassroom.com/class/refln/Lesson-1/The-Law-of-ReflectionPhysics Tutorial: The Law of Reflection - The Physics Classroom
The ray of light that leaves the mirror is known as the reflected ray (labeled R in the diagram). At the point of incidence where the ray strikes the mirror, a line can be drawn perpendicular to the surface of the mirror. This line is known as a normal line (labeled N in the diagram).
- The Role of Light to Sight
A mister is used to spray water into the air in the region...
- Specular Vs. Diffuse Reflection
Reflection off of smooth surfaces such as mirrors or a calm...
- The Line of Sight
The incident ray intersects the mirror at the same location...
- Lesson 2
It is customary to draw a bold line for the reflected ray...
- Why is an Image Formed
In the diagram below, there is an image of an object located...
- The Role of Light to Sight
Explain reflection from mirrors, describe image formation as a consequence of reflection from mirrors, apply ray diagrams to predict and interpret image and object locations, and describe applications of mirrors; Perform calculations based on the law of reflection and the equations for curved mirrors
- Terms Used in Reflection
- Specular Reflection
- Diffuse Reflection
Incident Ray:The ray of light that is incident on the interface.Reflected Ray:The ray of light that is reflected from the interface.Normal:The perpendicular to the interface.Angle of Incidence:The angle that the incident ray makes with the normal.In the case of specular reflection, the angle of reflection is equal to the angle of incidence, thus giving a mirror-like reflection.
In the case of diffuse reflection, the incident ray reflects from the interface in all directions. In other words, the angles of reflections are different for each reflected ray.
The incident ray reflects at the mirror's surface according to the law of reflection. But rather than measuring angles, you can merely draw the incident ray from the extreme of the object to the point of incidence on the mirror's surface.
- Image Formation by Plane Mirror. The "object" could be any physical object or a source of light, but we often depict it as an upright arrow.
- Concave Mirror. The distance from the focal point to the mirror is called the focal length, f. We will not go into the details of the proof, but it can be shown using the small angle approximation that the focal length is equal to half the radius of curvature
- Principal Rays of a Concave Spherical Mirror. Using rays to determine the location, orientation, and the size of the image is known as ray tracing.
- Deriving Equations for a Concave Spherical Mirror. Since we are using the small angle approximation (we assume that all distances are close to the optical axis), the mirror can be approximated as flat where light is reflected, as shown by the bold vertical line.
This video tutorial lesson introduces the vocabulary of reflection (incident ray, reflected ray, angle of incidence, and angle of reflection) and describes and illustrates the law of reflection. The application of the law of reflection to the viewing of images in plane mirrors is explained.
The two rays shown are those that strike the mirror at just the correct angles to be reflected into the eyes of the person. The image appears to be in the direction the rays are coming from when they enter the eyes.
