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
Unit 3 Lesson 9 Color--
Rainbows are a result of sunlight reflecting and refracting through raindrops that act like a prism, separating out visible light waves by their wavelengths. Violet and red light refract at sharp angles compared to blue and green light. Thus, as the white light separates, you see all the colors of the rainbow
- Why do you see different objects as different colors? For instance, why do you see grass as green? You see objects as different colors because some light waves are absorbed while others are reflected. Grass is green because it absorbs red, orange, yellow, blue, indigo, and violet, but reflects green. These green light waves are what your eyes detect, and so you can see grass.
- What happens when you mix primary colors of light? When you mix primary colors of light, which are red, green, and blue, you can see all the other colors.
- Why do you see the primary pigment color yellow? Primary colors are a result of light waves that are reflected and interpreted by your eyes. You can see yellow pigments because it absorbs blue light and reflects red and green light. When these red and green light waves overlap, your brain intercepts them as yellow. The primary pigment colors are cyan, magenta, and yellow.
Dispersion is when white light separates into colors
