Illuminance is the measurement of how bright a point source of light appears to the eye. |
The results are consistent with the predictions of continuum elasticity theory for the strain of a point source subject to an applied force. |
Shadows from a point source appear parallel when projected onto a flat surface. |
The light used must come from a point source, the smaller and the more intense it is the better. |
He also studied catacaustic curves in 1682, these being the envelope of light rays emitted from a point source after reflection from a given curve. |
It uses a point source of monochromatic light at the focus of a quality lens. |