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Learning Outcomes
Learning Outcomes
understand that light is a form of energy which is transmitted as electromagnetic radiation.
state that light is also called “Radiant Energy”
describe normal light/white light as a mixture of seven colours of light (ROYGBIV)
describe different colours of light as having different wavelengths and frequencies.
explain how light is reflected. (Reflection)
describe the properties of objects that are good reflectors of light
explain that white coloured objects reflect all colours of white light
explain that black objects absorb all the colours and reflect non.
explain what is Refraction of light
explain why refraction occurs.
compare refraction and reflection.
explain what is Dispersion
DEFINITION OF LIGHT
We can see because of light. Most light comes from the sun, light bulbs, and lasers. Light is a form of energy that moves in straight lines. It also reflects off things, and that reflected light enters our eyes, allowing us to see.
There are many sources of light.
There are many sources of light.
Sources of light can be divided into two groups: natural and made by humans. The sun is the most important natural source of light. The sun allows us to see during the day. Stars and lava from volcanoes also produce their own light. Some animals can produce their own light, such as fireflies and some glowing jellyfish.
Humans have created other sources of light. Light bulbs help us see in dark areas. Before light bulbs were invented, people used candles to provide light.
Laser beams are another source of light. Some high-powered laser beams can cause chemicals to explode!
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