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UNIT 8 Light and Optics

UNIT 8 Light and Optics. Wednes day February 22 nd. Light and Optics. Wednes day , February 22. TODAY’S AGENDA. Color and Polarization Refraction. UPCOMING…. Thurs : Thin Lenses Biconvex Lens Fri: Thin Lenses Biconcave Lens Mon: Total Internal Reflection. Chapter 13

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UNIT 8 Light and Optics

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  1. UNIT 8Light and Optics

  2. Wednesday February 22nd Light and Optics

  3. Wednesday, February 22 TODAY’S AGENDA • Color and Polarization • Refraction UPCOMING… • Thurs: Thin Lenses Biconvex Lens • Fri: Thin Lenses Biconcave Lens • Mon:Total Internal Reflection

  4. Chapter 13 Light and Reflection

  5. Chapter 13 Color • Additive primary colorsproduce white light when combined. • Light of different colors can be produced by adding light consisting of the primary additive colors (red, green, and blue).

  6. Additive Color Mixing (LIGHT)

  7. Color • Subtractive primary colors filter out all light when combined. • Pigments can be produced by combining subtractive colors (magenta, yellow, and cyan).

  8. Subtractive Color Mixing (PIGMENT)

  9. Polarization of Light Waves Light is polarized when its electric fields oscillate in a single plane, rather than in any direction perpendicular to the direction of propagation.

  10. Polarization of Light Waves Polarized light will not be transmitted through a polarized film whose axis is perpendicular to the polarization direction.

  11. Polarization of Light Waves When light passes through a polarizer, only the component parallel to the polarization axis is transmitted. If the incoming light is plane-polarized, the outgoing intensity is:

  12. Polarization of Light Waves This means that if initially un-polarized light passes through crossed polarizers, no light will get through the second one.

  13. Chapter 13 Polarization of Light Waves • Linear polarizationis the alignment of electro-magnetic waves in such a way that the vibrations of the electric fields in each of the waves are parallel to each other. • Light can be linearly polarized through transmission. • The line along which light is polarized is called the transmission axis of that substance.

  14. Chapter 13 Polarization of Light Waves Aligned and Crossed Polarizing Filters Aligned Filters Crossed Filters

  15. Polarization of Light Waves • Light can be polarized by reflection and scattering. • At a particular angle, reflected light is polarized horizontally. • The sunlight scattered by air molecules is polarized for an observer on Earth’s surface.

  16. END

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