Essential Question: How do images form by reflection?
Reflection Two types of reflection Regular or Specular Diffuse
Law of Reflection –the angle of incidence = the angle of reflection
Characteristics of Images in Plane Mirror
Characteristics of Images in Plane Mirror Image located as far into the mirror as object is in front of mirror. Virtual Image Erect Image Same Size Reverse left to right Image form directly in front of object
Can a person a position X see the image? object image X
Draw a line from X to the image. object image X
If the line of sight crosses the mirror then the image can be seen. object image X
The red arrows show the actual path of the light. object image X
Reflection from Parabolic Mirror Images formed by curved mirrors have different characteristics than those formed from flat mirrors.
Terminology of Curved Mirrors Center of curvature (C)– the center of the circle the mirror is a part of;twice the distance as F C F Principal axis
Terminology of Curved Mirrors Center of curvature (C)– the center of the circle the mirror is a part of;twice the distance as F/ C F Principal axis Focus(F) – the point where all rays parallel to axis reflect to; half the distance to C
Terminology of Curved Mirrors Center of curvature (C)– the center of the circle the mirror is a part of;twice the distance as F/ C F Principal axis Focus(F) – the point where all rays parallel to axis reflect to; half the distance to C Principal axis- the line passing through C, and F and the center of mirror
The size and type of image varies with the object’s distance (do) from the mirror. If the object is so far away that the rays come in parallel, the image will just be a point a the focus.
If the object is beyond f the image will always be real and inverted If the object is beyond f the image will always be real and inverted. The size will vary If the object is right at f an image will not form. If the object is less than f away, the image will be enlarged, erect and virtual.
The mirror equation: do di
Magnification Equation: h’ is image height h is object height
Images formed in Convex Mirrors:
Images formed in Convex Mirrors:
Images formed in Convex Mirrors: Images are always virtual, erect and smaller.
Large spherical mirrors have spherical aberration which causes the blurred images Making the mirror parabolic instead of spherical reduces the spherical aberration