1. We can see the objects when lights through transparent materials fall of the objects and then reflects into our eyes.
2. Opaque materials that do not allow light to pass through them.
3. A black image that was a result of the blocking of light in opaque materials is called a shadow.
4. Unjointed wires makes the circuit work.
5. Materials with dark colors absorb light that changes to heat.
6. A circuit can work even without a switch
