1 / 8

Reflection

Reflection. Plane waves at an interface may be absorbed. Discontinuity in materials Different permittivity Scattered wavelets cancel Materials can be opaque or translucent. Interface. At a discontinuity some of the backwards scattered waves coincide. This is called reflection .

sona
Download Presentation

Reflection

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Reflection

  2. Plane waves at an interface may be absorbed. Discontinuity in materials Different permittivity Scattered wavelets cancel Materials can be opaque or translucent. Interface

  3. At a discontinuity some of the backwards scattered waves coincide. This is called reflection. Present at all interfaces Reflected waves also form rays. Backscatter

  4. Clear materials also reflect at an interface. About 4% of the light energy is reflected at an air-glass interface. Significant if one side is darker Mirror Glass Photo by Michael Goltz Photo from visit-Chicago-Illinois.com

  5. If a surface is smooth then the reflected rays travel in parallel. This is called specular reflection. Specular Reflection

  6. If the surface is rough then reflected rays travel in different directions. This is called diffuse reflection. Diffuse Reflection

  7. Geometry describes a single ray reflected from a surface. The normal is a line perpendicular to the surface at the point the ray strikes. Angles are measured with respect to the normal. Incident angle qi Reflected angle qr Measuring Reflection

  8. Laws of Reflection • The relationship of the angles are called the laws of reflection. • Incident ray, reflected ray and the normal are all in the same plane • Angle of reflection equals the angle of incidence: θi = θr next

More Related