1. Light

2. What is light really? Electromagnetic radiation waves light is the range of frequencies of electromagnetic waves that stimulate the retina of the human eye light is a transverse wave

3. Light travels in straight lines at a speed of 186,000miles per second or 3x10 8 m/s it takes 8 minutes for light to travel 93 million miles to Earth it would take a car traveling at 60 mph 177 years to travel that distance light waves have wavelengths of about 400 nm (4x10 -7 m) to 700 nm (7x10 -7 m)

4. Notice the wavelength is long (Radio waves) and gets shorter (Gamma Rays)

5. Color White light is not a single color; it is made up of a mixture of the seven colors of the rainbow. We can demonstrate this by splitting white light with a prism: This is how rainbows are formed: sunlight is “split up” by raindrops.

6. “Just Passing Through:” What happens when light strikes glass? Or waxed paper? Or a book? If light travels through an object it is =transparent If light is blocked by an object and a dark shadow is cast it is= opaque. If some light passes through but not all and a light shadow is present it is=translucent.

7. 3 Ways to Control Light: 1.Block it- Shadows 2.Bend it- Refraction 3.Reflect it- Reflection

8. Blocking Light light travels in a straight line shadows (the absence of light) are created when light is blocked

9. Bending Light refraction change in the direction of waves crossing a boundary between two different media

10. Contact Lenses

11. Reflecting Light light rays are reflected with an angle equal to the angle of incidence

12. Concave Mirrors focus light to one point Example: headlights on a car

13. Concave Mirrors

14. Convex Mirrors reflect light outward creates a fish eye image Example: side view mirrors on a car