The refraction and recombination of light ... can identify minerals using how they appear in doubly polarized light under a microscope! Hornblende (brown) with dark reaction rims in plain (singly ...

The pressure exerted on a surface when it is struck by light is tiny ... useful in the future development of plasmonic circuits. Microscopes have not changed very much in the past few centuries.

When a wave or light ray moves from one medium to another its speed changes. The direction of the ray may also change. This property of waves is called refraction and commonly occurs with light rays.