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## PowerPoint Slideshow about ' Reflection and Mirrors' - temima

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### Reflection and Mirrors

Seeing Yourself

Law of Reflection

The law of reflection states that the angle of incidence is equal to the angle of reflection.

Definitions

- Incident ray is the ray moving toward the surface
- Reflected ray is the ray moving from the surface
- Normal is an imaginary line perpendicular to the surface

More Definitions

- Angle of incidence is the angle between the incident ray and the normal
- Angle of reflection is the angle between the reflected ray and the normal

Regular Reflection

Rays of light hit a smooth surface. The reflected rays bounce off the surface parallel to each other.

Diffuse Reflection

- Rays of light hit a rough surface. The reflected rays are not parallel to each other when they bounce off the surface.

Images

- An Image is the point where extended reflected rays of light intersect.
- Real image—formed by converging light rays and can be displayed on a screen
- Virtual Image—an image that can be seen by the observer but cannot be projected on a screen because light from the object does not actually come to a focus.

Plane Mirrors

- Image is the same size as the object
- Image is the same distance behind the mirror as the object is in front of the mirror.
- The front and back of image of are reversed.
- Virtual image.

Ray Diagrams

- A ray diagram is a diagram which traces the path which light takes in order for a person to view a point on the image of an object. On the diagram, rays (lines with arrows) are drawn for the incident ray and the reflected ray.

Concave Mirrors

- Concave mirrors are shaped like the inside of a spoon
- Parallel rays of light are reflected towards a single point—the focal point
- The real image is inverted and in front of the mirror.
- The virtual image is erect and behind the mirror.

Image from a concave mirror depends on the placement of the object in relation to the mirror

http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=48

Convex Mirrors

- A convex mirror is shaped like the outside bottom of a spoon.
- Convex mirrors produce an erect virtual image behind the mirror.
- Convex mirrors are used as rearview mirrors in cars and in stores to observe shoppers.

Spherical Aberration

- Curved mirrors that are made from part of a sphere do not reflect all rays of light through the focal point.
- Parabolic mirrors are used when a sharp focus is needed—they do not have spherical aberration.

The Mirror Equation

- f is the focal length (distance from mirror to focal point)
- do is the distance from the mirror to the object
- di is the distance from the mirror to the image
- The focal length of a curved mirror is ½ of the radius of curvature.

Magnification Equation

- m is the magnification
- Positive m represents an erect image
- Negative m represents an inverted image
- hi is the image height
- h0 is the object height
- di is the image distance
- do is the object distance

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