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Lenses and Mirrors

Lenses and Mirrors. Tuesday, July 14, 2009. Model of light. Light travels in a straight line. Represented by a Ray. Law of Reflection. The incoming angle to the normal (perpendicular to the surface) is ALWAYS the same as the outgoing angle from the normal.

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Lenses and Mirrors

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  1. Lenses and Mirrors Tuesday, July 14, 2009

  2. Model of light • Light travels in a straight line. • Represented by a Ray

  3. Law of Reflection The incoming angle to the normal (perpendicular to the surface) is ALWAYS the same as the outgoing angle from the normal. i..e Angle of incidence = Angle of reflection

  4. Does the law of reflection hold for all objects reflecting light? • Is so, why can we see our image in a book?

  5. Image in a Flat Mirror Dobject =Dimagehobject= h image

  6. Reflection in a curved mirror Light parallel to the principal axis reflects through the focus in a concave mirror. The same parallel light appears to come from the focus in the convex mirror.

  7. Image in a Convex mirror Image = virtual, erect, smaller. Formed from diverging rays.

  8. Images in a Concave mirror Image = Virtual, larger, erect

  9. Images in a concave mirror No image forms

  10. Images in a concave mirror If object is beyond the focal point = Real image, inverted, smaller, between the Center of curvature and focal point.

  11. Mirror Equations

  12. Concave Lenses Image = virtual, smaller, erect

  13. Images in a convex lens

  14. Snell’s Law

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