Transcript
By: Berta Celdrán Puche
4º A
We need light to see
•Light moves in a straight line.
•Light moves very fast.
The shadow of an object is always formed on the opposite side to the source of light.The light we get from the Sun is called white light. We can also see them in a rainbow.We can make all the colours from just three colours: blue, red and yellow. These are the primary colours. Light travels at 300.000 km per second.
White light is a mixture of seven colours: red, orange, yellow, green, blue, indigo and violet.
Transparent
objects
Translucent
objects
Opaque objects
Like clear glass bottles allow light to pass through.
Allow some light to pass through.
For example wood and cardboard, do not allow light to pass through.
Natural luminous bodies , like the Sun, produce light.
Natural luminous bodies , like the Sun, produce light.
Artificial luminous bodies, like candles and matches, are man-made.
Artificial luminous bodies, like candles and matches, are man-made.
Produce no light.Produce no light.
Heat goes from one body to another.
Heat goes from hot bodies to colder bodies.
Conductors Insulators
Material like iron, aluminium and glass. They get hot and cold quickly.
Materials like wood and plastic.They get hot and cold slowly.
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