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Reflection

Explore the law of reflection and the types of mirrors including plane, concave, and convex mirrors. Learn about ray tracing diagrams, mirror equations, and image formation. Understand the concept of magnification and the sign conventions used in mirror equations.

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Reflection

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  1. Reflection Physics Department, New York City College of Technology

  2. Reflection The law of reflection Plane mirror Concave mirror Convex mirror Mirror equation Ray tracing diagram Key words

  3. The incident and reflected rays lie in the same plane with the normal to the surface The angle of reflection equals the angle of incidence Normal to surface Angle of incidence Angle of reflection Incident light ray i r Reflected light ray Law of reflection

  4. Reflection/refraction from plastic block • Disc 22 #6

  5. Do is object distance Di is image distance For a plane mirror Do=Di Image formed by a plane mirror

  6. Spherical mirrors • Spherical mirrors • convex • Concave • Ray diagram • principal axis • focal point • focal length • radius of curvature

  7. Image formed by a spherical mirror • Three special rays • Ray 1: P ray • Ray 2: F ray • Ray 3: O ray

  8. Mirror equation • Making use of geometry we can prove • Magnification

  9. Mirror equation (continued) • The sign conventions: • ho: + • hi: + for upright image,  for inverted image • di/do; + if in front of the mirror,  if behind the mirror • f: + for concave mirror,  for convex mirror

  10. Example #1 • Spherical mirror

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