My lecture at Corsicana High School about Light...

2. WAVES MECHANICAL ELECTROMAGNETIC TRANSVERSE LONGITUDINAL SURFACE

3. Conceptual Physics Chapter 25 CREST TROUGH WAVE LENGTH AMPLITUDE SPEED FREQUENCY PERIOD

4. Reflection Refraction Diffraction Interference Constructive Destructive Doppler Effect Loudness Pitch Resonance

6. Visible light is that portion of the electromagnetic spectrum which stimulates the retina of the human eye. Visible spectrum wavelengths range from about 400 nm (violet) to 760 nm (red) . Light travels at about 3 x 10 8 m/s through empty space and slightly slower through air. Remember that for all waves, v = f  .

10. One obvious property of light is that it reflects off of surfaces. Among other things, this gives rise to the images we see in mirrors.

11. Light refracts , which means that it bends when passing from one medium to another. When light enters a more dense medium from one that is less dense, it bends towards a line normal to the boundary between the two media.

12. The greater the density difference between the two materials, the more the light bends. One place where this is used is in lenses for a variety of optical devices, such as microscopes, magnifying glasses, and glasses for correcting vision. An example of an image formed from a lens is shown below.

13. An effect that combines both refraction and reflection is total internal reflection . Consider light coming from a dense medium like water into a less dense medium like air.

14. Another property that light exhibits is that it diffracts , which loosely speaking means it bends around the corner when it passes through an opening.

15. The final property of light to discuss is interference , a phenomenon that occurs when two light beams meet. If the two beams enhance each other to give a brighter beam, it is called constructive interference If they beams interfere in a way that makes the total beam less bright, it is called destructive interference.

16. Another aspect of light that is quite familiar is dispersion. If a beam of white light enters a glass prism, what emerges from the other side is a spread out beam of many colored light. The various colors are refracted through different angles by the glass, and are ``dispersed'', or spread out.

17. Property of certain types of waves that describes the orientation of their oscillations

21. Although we still commonly characterize light as a wave, it is actually neither a wave nor a particle. It seems to have characteristics of both. The modern view of the nature of light recognizes the dual character: Light is radiant energy transported in photons that are guided along their path by a wave field.

23. In the photoelectric effect, electrons are emitted from matter (metals and non-metallic solids, liquids or gases) as a consequence of their absorption of energy from electromagnetic radiation of very short wavelength, such as visible or ultraviolet light. PHOTONS

24. Fiber-optic communication is a method of transmitting information from one place to another by sending pulses of light through an optical fiber. The light forms an electromagnetic carrier wave that is modulated to carry information. First developed in the 1970s, fiber-optic communication systems have revolutionized the telecommunications industry and have played a major role in the advent of the Information Age.

26. Do we see because we have eyes or because there is light?

28. “ Our deepest fear is not that we are inadequate. Our deepest fear is that we are powerful beyond measure. It is our LIGHT , not our darkness, that most frightens us. We ask ourselves, who am I to be brilliant, gorgeous, talented, and fabulous? Actually, who are you not to be? You are a child of God. Your playing small doesn’t serve the world. There’s nothing enlightened about shrinking so that other people won’t feel insecure around you. We are all meant to shine, as children do. We are born to make manifest the glory of God that is within us. It’s not just in some of us, it’s in everyone. And as we let our own LIGHT shines, we unconsciously give other people permission to do the same. As we are liberated from our own fear, our presence automatically liberates others.”

31. The appearance of objects or light sources described in terms of the individual's perception of them, involving hue, lightness, and saturation for objects and hue, brightness, and saturation for light sources.

32. C O L O R Materials may be classified as: transparent - readily transmits light; can clearly see objects through them translucent - transmits, but diffuses, light; cannot see objects clearly through them opaque - transmits no light; cannot see through them

40. Complimentary colors are two colors that combine to form white light. Red and cyan , blue and yellow , green and magenta are pairs of complimentary colors. Red, blue, and green are called primary colors or secondary pigments . Cyan, yellow, and magenta are called primary pigments or secondary colors .

42. These sites let you simulate mixing colors and pigments of light: link1 , link2 , link3 Learn more about color mixing here .

45. When light travels from one medium to another, it generally bends, or refracts . The law of refraction gives us a way of predicting the amount of bend. The law of refraction is also known as Snell's Law.