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1. 
The return of light from an object, after it bounces off.
2. 
The bending of light when it passes from a particular substance to another.
3. 
The transfer of heat between substances that are not in direct contact with each other.
4. 
The transfer of heat through gases and liquids.
5. 
The transfer of heat through substances that are in direct contact with each other.
6. 
Best possible reflectors. They form the image of an object placed in front ot them.
7. 
Any substance through which light travels.
8. 
Piece of curved glass which can make objects look bigger or smaller.
9. 
The result of increasing the thermal energy in a solid and turning it into a liquid.
10. 
The result of increasing the thermal energy in a liquid and turning it into a gas.
11. 
The result of increasing the thermal energy of a substance, which increases its volume too.