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Young pupils studying for SAT

How to

How to comprehend light

Sources and reflectors of light
- A source makes its own light.
- The sun and other stars, very hot metal and fires are sources of light.
- The moon is not a source of light. It reflects light from the sun.
- Planets do not make their own light. They reflect light from the sun.
- When driving at night 'cat's eyes' on the road reflect light from the car's headlamps.
- A reflector of light such as a mirror will not be seen in a completely dark room.

Seeing a light source
- We see a light source when light from the source enters our eyes.
- Danger! You must never look directly at the sun. The amount of light travelling from it will damage your eyes very quickly.
- Fireflies and glow-worms make their own light to attract mates.

Shadows
- Light can travel through some transparent materials so that you can see clearly the light source.
- Light can travel through some translucent materials, but the light source will not be seen clearly.
- Light cannot travel through opaque materials. The light is blocked.
- A shadow is formed where light is blocked.
- If an object is moved closer to a light source the shadow gets bigger.


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Tips of the day
A long word is a word that has more than one syllable (i.e., multisyllabic). A syllable is a word or part of a word that is spoken with a single sound of the voice. Using the Syllable-Building Strategy will help you spell long words such as democratic. <...
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