Light and Shadow
저자: TAN TIENG SAN PEARLYN
1. Some examples of light are
1.1. Stars
1.2. Sun
1.3. fire
1.4. lamp
2. MOON IS NOT A LIGHT SOURES. IT REFLECTS LIGHT FROM THE SUN.
3. The speed of light in a vacuum is defined to be exactly 299,792,458 m/s (approximately 186,282 miles per second).
4. examples of things that will cast a shadow
4.1. cardboard
4.2. metal
5. Light is a form of energy
6. Shadow is a dark patch of light
