Why do we have shadows?
Автор: MooMooMath and Science
Загружено: 2018-01-24
Просмотров: 71543
Описание:
What are shadows? Shadows are created when light is blocked by an object.
What is Light?
Light is a form of energy and travels as a particle and a wave.
Most objects don’t make their own light.
The Sun, lamps, flashlights, and fires are all sources of light.
Humans see light in seven different colors: Red, Orange, Yellow, Green, Blue, Indigo, and Violet.
Notice how it spells ROY G BIV
All objects reflect or absorb the seven different colors of light. Objects appear to be different colors based on what colors they reflect.
What is a Shadow?
A shadow is light blocked by an object.
Shadows need a light source and an object.
In this picture, the light source is the sun and the object is the rock.
The object can block all or part of the light.
Shadows show the shape of an object.
Shadows change size based on how close they are to the light source.
You can make a shadow bigger by moving the object closer to the light.
You can make a shadow smaller by moving the object away from the light.
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