A ray diagram showing refraction at the boundary between air and glass Refraction can cause optical illusions as the light waves appear to come from a different position to their actual source.

sound waves cause air particles to vibrate back and ... of low pressure due to particles being spread further apart. In the diagram, the compression moved from left to right and energy is ...

SiOC@C ceramic nanosphere precursor was obtained using a liquid phase method. Then, a series of SiOC@C ceramic nanospheres containing SiC/Si3N4, free carbon, and amorphous SiOC were successfully ...