The return of radiation by a surface, without change in wavelength.

The Reflection of Light

What is it about objects that let us see them? Why do we see the road, or a pen, or a best friend? If an object does not emit its own light (which...


How do Chameleon's Change Color?

A chameleon’s skin can quickly and dramatically change color; its eyes allow it to look in almost all directions without moving its head, and...