We need light to see objects Light is energy (electromagnetic). ts/science_what_is_light.htm

Light energy you can see ( colors/rainbow ) is visible light Light energy is created by particles called photons. Photons of objects will either emit (give off), reflect, or scatter light energy.

Color Red Orange Yellow Green Blue Indigo Violet Each color has a different amount of energy. Red has the least amount of energy while each color in order gradually gains energy, with violet light having the greatest amount.

White-is all the colors reflected back to your eye. Black-is when all colors are absorbed and none of the colors are reflected back to your eye. The color you see is when all the colors are being absorbed but the one color that is reflected back to your eye.

Filters When looking through a Red filter all colors of ROY G. BIV are absorbed but the color red. When looking through a Blue filter all colors of ROY G. BIV are absorbed but the color blue. When looking through a Green filter all colors of ROY G. BIV are absorbed but the color green.

Prisms can refract (redirect) light. Prisms also separates white light into the colors of the visible light spectrum. Refraction Separating White Light

Primary Colors Light Energy’s primary colors are: Blue, Red and Green Pigment primary colors are: Yellow, Red and Blue

Light travels in a straight line. The surface that light hits will change the behavior of light. Characteristics of a good mirror: Flat Surface Shiny Surface Smooth (Light must be present)

Light can change direction when it passes through transparent materials. Light travels fastest through a vacuum, slower through air, slower through a clear glass and even slower through water.

When light hits a reflective flat surface the ray of incoming light is called the incident ray, the out coming ray of light is called the reflective ray.

Angle of Incidence Mirror Reflective ray Incident Ray Angle of Reflection Angle of Incidence Angle of Reflection Equals Angle of Incidence Normal Light Box

Concave Surface Convex Surface Concave and Convex Incoming Light Reflected Light

Light traveling through air and water. Focal Point

Water can be used to magnify objects it acts like a lens.

Lab 17 When light enters the block it slows down and refracts and moves closer to the normal line. When light leaves the block the emergent ray moves farther away from the normal line.