Curved Mirrors

Goal of the class To understand ray diagrams and how curved mirrors work. Question of the Day: How is the focal point related to the curvature? Previous Answer: No previous questions Previous question: What is infrasonic sound?

Types of Images Real – image appears in front of the mirror (could be projected onto a screen) Virtual – image appears behind the mirror Design and build a periscope, Using a laser to measure sugar / salt concentrations, Measuring the data track separation of a music cd Dampening sound waves for sound insulation buy layering. http://www.juliantrubin.com/fairprojects/physics/optics.html http://www.juliantrubin.com/fairprojects/physics/sound.html

Size Enlarged – image is larger than object Reduced – image is smaller than object Same – image and object are same size

Attitude Upright – image is right-side up Inverted – image is upside-down Laterally inverted – image is flipped horizontally

Curved Mirrors

Concave Mirrors

Concave Mirrors

Terminology Focal point (F) – where the light rays meet Vertex – the middle point of the curved mirror Focal length (f) – the distance between focal point and focal length

Ray Diagrams Ray 1 – travels parallel to the principal axis and reflects through the focal point (F).

Ray Diagrams Ray 2 – travels through the focal point and reflects parallel to the principal axis.

Ray Diagrams The point where the rays converge is the location of the image