Lesson 6 Unit 3 Electromagnetic Waves-
Electromagnetic Waves- transverse waves consisting of charging electric fields and changing magnetic fields. Electromagnetic waves are different from mechanical waves in how they are produced and how they travel.
How they are produced- They are produced by constantly changing fields. Electric Field in a region of space exerts electric forces on charged particles. They are produced when an electric charge vibrates or accelerates.
Unit 3 Lesson 8 Behavior of Light--
Sunsets demonstrate the scattering of light as the blue and some of the green colors have scattered and all that your eye detects are yellow, red, and orange
Reflection in water by parallel light waves
Sunglasses are polarized meaning they filter out horizontal light, reducing glare and improving vision in the sun
Mirages are examples of light being reflected
Refraction- when light enters a new medium it bends, and this happens because it changes speed when light goes through less dense or more dense objects
Angle of Refraction: the amount the wave bends
Diffraction- the bending and spreading of waves, usually around an object
Notes--
Materials can be transparent, translucent, or opaque
Transparent: transparent material transmits light, which means it allows most of the light that strikes to pass through it
Ex: windows allowing buildings and trees to be seen or where the water where fish and coral live
Translucent: If you can see through a material, but objects look blurry, then the material is translucent. This material scatters light
Opaque: Most materials are opaque, which means you cannot see through them. This material either absorbs or reflects all the light that strikes it.
Interactions of Light--
When light strikes a new medium, it can be reflected, absorbed, or transmitted. When light is transmitted, it can be refracted, polarized, or scattered.
Reflection- image is a copy of an object formed by reflected waves of light.
Regular Reflection- occurs when parallel light waves strike a surface and reflect all in the same direction. This happens when light strikes a smooth surface such as a mirror
Diffuse Reflection- occurs when parallel light strikes a rough, uneven surface and reflect in many directions
Polarization: light with waves that vibrate in only one plane is polarized light
Scattering- Earth's atmosphere contains many molecules and other tiny particles. These particles can scatter sunlight. Scattering means that light is redirected as it passes through a medium
