including sound and light - can be reflected at the boundary between two different materials. The reflection of sound causes echoes. For example, if a light ray hits a surface at 32°, it will be ...

To investigate the reflection of light by different types of surface, and the refraction of light by different substances. Remove the block. Join the crosses to show the paths of the light rays ...

A fascinating effect in photography: reflections, shadow images and soap bubbles in the bokeh. We present such photos in this ...