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How does light travel?~Sources of light...
Light is a form of energy. We
get light from the light sources. Some objects that emit or produce own light
such as the Sun and other stars are called natural light sources. Insects such
are fireflies and marine animals such as squids and jellyfish glow as a result
of chemical reaction that gives out light. Other light sources such as torch,
burning candle, electric bulb and burning fuels transform different forms of
energy into light energy. These are called artificial light sources. These
objects that emit or give out light are said to be luminous. We can see
luminous objects because the light that they emit enters our eyes directly. On
the other hand, object such as our body, book, building and stones, which do
not emit light are known as non-luminous.
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