Light Review Flashcards
Incandescence
Emission of light by a hot object
Example: Hot coals, the sun.
Fluorescence
Fast emission of light by a hot object
Examples: Fluorescent lights
Phosphorescence
Slow emission of light by particles that have absorbed energy
Examples: glow in the dark stickers
Chemiluminescence
Emission of light due to a chemical reaction
Examples: Glow stick, Flare.
Electroluminescence
Emission of light when electricity passes through a material called a semiconductor
Examples: LEDs
Bioluminescence
Emission of light from a living organism
Examples: Fireflies, angle fish.
Light entering other substances bends _______the normal line.
Towards
Light leaving a substance and entering the air bends _______ the normal line
Away From
When light refracts, the angle in the air is always ______ than the angle in the other substance
Greater
Convex Mirror
curves outward. It reflects light outward in diverging rays. Images appear smaller and increase the field of view.
Concave Mirror
Curves inward. It reflects light inward in converging rays. When you are close to the mirror, the images appear bigger. When you are far from the mirror, images appear smaller and flipped.
How are shadows formed?
Shadows are formed when an opaque object is placed in the path of light rays.
What determines the size of a shadow?
The distance between the object and the light source. When the light is closer to the object, the shadow appears bigger. When the light is far from the object the shadow appears smaller.
What is the difference between Reflection and Refraction?
Reflection is when light bounces back off a surface. Refraction is the bending of light rays when it travels from one medium to another.
What is the Ray Model Of Light?
The ray model of light states that light travels in straight lines.
