Presentation is loading. Please wait.

Presentation is loading. Please wait.

Plane Mirror: a mirror with a flat surface

Similar presentations


Presentation on theme: "Plane Mirror: a mirror with a flat surface"— Presentation transcript:

1 Plane Mirror: a mirror with a flat surface
Mirrors Plane Mirror: a mirror with a flat surface Plane mirrors create virtual images. A virtual image is a point at which light rays appear to diverge without doing so.

2 Plane Mirrors Image Point Source – point at which the object appears to be in the mirror from any vantage point in front of the mirror.

3 A similar cylinder can be placed behind a mirror to indicate the image point of the cylinder placed in front of the mirror

4

5 The image formed by a plane mirror appears to be at a distance behind the mirror that is equal to the distance of the object in front of the mirror.

6 Spherical Mirrors Converging Mirrors – A mirror where parallel light rays will intersect at a common point (focal point) upon reflection. Such mirrors are also referred to as a Concave Mirrors Diverging Mirror – A mirror where parallel rays diverge upon reflection, as though the reflected rays come from a focal point behind the mirror. Such mirrors are also referred to as Convex Mirrors

7 Ray Diagrams Three types of rays used to find the location and magnitude of an image Parallel Ray is a ray that is incident along a path parallel to the optic axis and is reflected through the focal point Chief Ray or Radial Ray is a ray incident through the center of curvature (C). Since it is incident normal to the mirror’s surface, this ray is reflected back along its incident path, through C. C is the center of curvature Focal Ray is a ray that passes through the focal point and is reflected parallel to the optic axis F is the focal point C = 2f f is the focal length

8 Focal Point A Focal Point is a point location where parallel rays that are reflected from a mirror meet.

9 Images Formed with Concave Mirrors
Parallel Ray and Focal Ray are needed to determine the location and size of object.

10 Images Formed with Concave Mirrors
When object Beyond C: Image is Real Inverted Smaller do > di ho > hi

11 Images Formed with Concave Mirrors
When object is at C Image is Real Inverted Same Size do = di ho = hi

12 Images Formed with Concave Mirrors
When object is between C and F Image is Real Inverted Larger do < di ho < hi

13 Images Formed with Concave Mirrors
When object is at F No Image

14 Images Formed with Concave Mirrors
When object is between F and Mirror Image is Virtual Erect Larger do < di ho < hi

15 Object Location

16 Overview Object Image Object Image

17 Convex Mirrors and Images
All Images are Virtual Erect Smaller do > di ho > hi

18 Mirror Equations Signs for f = Focal Distance di = Image Distance
do = Object Distance The focal length f is positive for concave mirrors and negative for convex mirrors A more useful Equation Common to find image location The object distance do is always positive The image distance di is always positive for a real image (same side of mirror as object) and negative for a virtual image (forms behind the mirror) M = Magnification hi = Height of Image The magnification M is positive for an upright image and negative for an inverted image ho = Height of Object


Download ppt "Plane Mirror: a mirror with a flat surface"

Similar presentations


Ads by Google