e***@gmail.com
2017-01-25 10:50:54 UTC
Light needs a surface to bounce off, otherwise
light cannot be detected, for example when in a dark room, a light
bulb or cfl is switched on then we can see the furniture, walls
in that room because the light is bouncing/reflecting of those objects/surfaces.
When a laser pointer is pointed at a screen or at a target that spot can be detected
because the laser beam falls on the target and bounces back and then is detected
by a photosensor.
But, what if it was possible to detect a spot or point of light in just air, without
the need of a surface for that spot/point to bounce of.
What would be the practical applications of such an invention?
light cannot be detected, for example when in a dark room, a light
bulb or cfl is switched on then we can see the furniture, walls
in that room because the light is bouncing/reflecting of those objects/surfaces.
When a laser pointer is pointed at a screen or at a target that spot can be detected
because the laser beam falls on the target and bounces back and then is detected
by a photosensor.
But, what if it was possible to detect a spot or point of light in just air, without
the need of a surface for that spot/point to bounce of.
What would be the practical applications of such an invention?