In a ray diagram, a concave lens is drawn as a vertical line with inward facing arrows to indicate the shape of the lens.

A team of researchers has demonstrated a plasma lens capable of focusing attosecond pulses. This breakthrough substantially ...

Draw a ray from the object to the lens that is parallel to the principal axis. Once through the lens, the ray should pass through the principal focus. Draw a ray which passes from the object through ...

When people look into a mirror, they see an image of themselves behind the glass. That image results from light rays encountering the shiny surface and bouncing back, or reflecting, providing a ...

We've seen plenty of curved screens, but Sony has just revealed the first picture taken with a curved image sensor that may one day bring cheaper, smaller lenses and higher photo quality. Regular, ...