It is refraction that makes some objects appear to bend when they are viewed through water, like the straw shown here. If the light hits the surface of a glass block at an angle, this change in ...

Refraction occurs when light changes direction as it passes ... diffraction limit or developing cloaking devices that render objects invisible. While negative refraction has been achieved in ...

which said that objects only moved if an external force drove that motion. Newton was also the first to understand the rainbow, and to refract white light with a prism into its component colours ...