Images formed by Mirrors

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Presentation transcript:

Images formed by Mirrors

What are some uses of mirrors?

Plane Mirrors How can we describe images formed by plane mirrors? Size Same size as object Magnification = 100% Attitude Upright Location Behind the mirror Image appears to be the same distance from mirror as the object Type Virtual

Curved Mirrors Two types Concave: focuses parallel beams of light to a point Convex: spreads out parallel beams of light

Curved Mirrors

Curved Mirrors

Vocabulary Label the following on the diagram below: Center of curvature Focal point Incident ray Principal axis Reflected ray Object Mirror Is the mirror above convex or concave?

Types of Images Real images Virtual images Image formed by actual light rays coming together (converging) Use a screen to see the image formed Virtual images Image formed by “virtual” light rays (dotted lines) Image cannot be seen on a screen

How to Draw Concave Mirror Diagrams Instructions Diagram Draw a ray from the top of the object parallel to the principal axis. This ray will reflect through the focal point. Draw a ray from the top of the object through the focal point and on to the mirror. This ray will reflect parallel to the principal axis. Extend the reflected rays until they cross. (If you need to extend the reflected rays behind the mirror, use dashed lines.) The point where the rays meet is the top of the image.

Cases for Concave Mirrors Image is… How to see image Diagram Object between C and F Larger Inverted Real Use a screen placed in front of mirror. Object at F No image formed Object between F and mirror Upright Virtual Observer looks into mirror to see image.

Practice: Concave Mirror Diagrams

How to Draw Convex Mirror Diagrams Instructions Diagram Draw a ray from the top of the object parallel to the principal axis. This ray will reflect as if it came from the focal point. Draw a ray from the top of the object toward the focal point (stop at the mirror). This ray will reflect parallel to the principal axis. Extend the reflected rays behind the mirror using dotted lines until they cross. The point where the rays meet is the top of the image.

Cases for Convex Mirrors Image is… How to see image Diagram All distances in front of the mirror Smaller Upright Virtual Observer looks into mirror to see image.

Practice: Convex Mirror Diagrams

What kind of mirrors are being used?

End here!

Vocabulary Center of curvature Concave Convex Focal point Incidence Incident ray Normal Plane Principal axis Real Reflected ray Reflection Virtual