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Lecture%2037%202220%20Spring%202009

# Lecture%2037%202220%20Spring%202009 - Reminders and...

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1 Reminders and Announcements HW 21 is due Friday Exam 3 is next Monday (Chs. 31-35) • Help Room Hours (Physics 117): Help Room Hours (Physics 117): – M 4-8 pm, T 3-6:30, W 3-6:30, R 4:30-8, F 2-6 Ray Diagrams • A ray diagram can be used to determine the position and size of an image • They are graphical constructions which They are graphical constructions which reveal the nature of the image They can also be used to check the parameters calculated from the mirror and magnification equations Drawing a Ray Diagram To draw a ray diagram, you need to know: The position of the object The locations of the focal point and the center of curvature Three rays are drawn They all start from the same position on the object The intersection of any two of the rays at a point locates the image The third ray serves as a check of the construction Ray Diagram for a Concave Mirror, p > R The center of curvature is between the object and the concave mirror surface The image is real The image is inverted The image is smaller than the object (reduced) Ray Diagram for a Concave Mirror, p < f The object is between the mirror surface and the focal point The image is virtual The image is upright The image is larger than the object (enlarged)

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