Flat mirrors
1 / 17

Flat Mirrors - PowerPoint PPT Presentation

  • Uploaded on

Flat Mirrors. Chapter 14 Section 2. Light and How It Travels. Light traveling through a uniform substance travels in a straight line. Air Water Vacuum Etc… Once light encounters a different substance, its path will change. Air to water Vacuum to glass to air. Opaque.

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
Download Presentation

PowerPoint Slideshow about 'Flat Mirrors' - ayanna

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.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Flat mirrors

Flat Mirrors

Chapter 14 Section 2

Light and how it travels
Light and How It Travels

  • Light traveling through a uniform substance travels in a straight line.

    • Air

    • Water

    • Vacuum

    • Etc…

  • Once light encounters a different substance, its path will change.

    • Air to water

    • Vacuum to glass to air


  • Opaque material is a substance that does not allow light to transmit through it.

    • Most material is opaque.

  • Some of the light is absorbed by the material and the rest of it is deflected off the surface.


  • Reflection – The turning back of an electromagnetic wave at the surface of a substance.

    • Basically, a change in the direction of light.

  • Most materials absorb at least some of the incoming light and reflect the rest.

  • A mirror reflects almost all the light.

Reflection depends upon the surface
Reflection Depends Upon The Surface

  • The reflection of light depends upon the smoothness of the surface which the light is in contact with.

    • Diffuse reflection is when light is reflected in many directions.

      • Paper, wood, cloth, etc..

    • Specular reflection is when the light is reflected all in the same direction.

      • Glass mirror, shiny metals, water.

Angles of reflection
Angles of Reflection

  • Incoming angles of light are equal to outgoing angles of light on a smooth surface.

Angle of incidence
Angle of Incidence

  • Angle of Incidence - The angle between a ray that strikes a surface and the normal to that surface at the point of contact.

    • A line perpendicular to the reflecting surface is referred to as the “normal.”

  • Variable for Angle of Incidence

    • θ (theta)

Angle of reflection
Angle of Reflection

  • Angle of Reflection – The angle formed by the line normal to a surface and the direction in which a reflected ray moves.

  • Variable for Angle of Reflection

    • θ’ (theta prime)

Incidence and reflection
Incidence and Reflection

  • The angle of incidence and angle of reflection are equal on a reflection surface.

    θ = θ’

    Angle of incoming light ray = Angle of reflected light ray

Angle between light and surface
Angle Between Light and Surface

  • The angle between the reflective surface and the incoming light ray equals 90º - θ.

  • The angle between the reflective surface and the reflected light ray equals 90º - θ’.

Flat mirror
Flat Mirror

  • The simplest mirror is a flat mirror.

  • An object is placed a certain distance away from a mirror’s surface (p – object distance).

  • To an observer looking at the mirror, these rays appear to come from a location on the other side of the mirror (q – image distance)

Object distance image distance
Object Distance & Image Distance

  • The object distance and image distance are equal on a flat mirror.

  • Similarly, the image of the object is the same size as the object.

Virtual image
Virtual Image

  • Virtual Image – An image formed by light rays that only appear to intersect.

    • Also known as an Imaginary Image.

  • A flat mirror always forms a virtual image, which can only be seen “behind” the surface of the mirror.

  • A virtual image can never be displayed on a physical surface.

Ray diagrams
Ray Diagrams

  • Ray diagrams are drawings that use simple geometry to locate an image formed by a mirror.

Ray diagrams and flat mirrors
Ray Diagrams and Flat Mirrors

  • A ray diagram procedure will work for any object placed in front of a flat mirror.

  • The image formed by a flat mirror appears to have right-to-left reversal.