What is incident and reflected light什么是入射与反射的光.docVIP

Fiber Optics and Laser instruments UNIT.1 1.What is incident and reflected light? Incident Light Light approaching a surface is known as Incident light. This is the incoming light before it has reached the surface. Reflected Light: After light has struck a surface and bounced off, it is known as reflected light. This is the light that is now departing from the surface. 2. What is angle of incidence and angle of reflection? angle of incidence: The angle between an incident ray and the normal to a reflecting or refracting surface. The angle at which a ray of light approaches a surface, reflective or not, is called the angle of incidence. It is measured from an imaginary line perpendicular to the plane of the surface in question to the incoming ray of light. 3. Angle of Reflection: Once the light has reflected from a reflective surface, the angle at which the light departs from the surface is called the angle of reflection . This angle is also measured from a perpendicular to the reflecting surface to the departing ray of light. When light reflects from a surface, the angle of reflection is always equal to the angle of incidence. 4. Define critical angle? In geometric optics, at a refractive boundary, the smallest angle of incidence at which total internal reflection occurs. 5. What is fiber optics? Fiber optics is a medium for carrying information from one point to another in the form of light. Unlike the copper form of transmission, fiber optics is not electrical in nature. A basic fiber optic system consists of a transmitting device, which generates the light signal; an optical fiber cable, which carries the light; and a receiver, which accepts the light signal transmitted. 6.What is bandwidth and wavelength?