On Mon, 25 Nov 2002, Shachar Shemesh wrote: > I accidentally flashed into someone's eye a tiny laser pointer (it is > run by two digital watch batteries, not even aaa) THOUGH A PIECE OF > WHITE PAPER, that supposedly reflects most of the light (that's why it
the white material indeed reflects most of the light (in the visible range). light passes through it not because it is transparent (in the same sense that glass is- the light passes through the material itself), but because of diffraction- AKIFA and HITABCHUT. being a laser, you may actually get HITABCHUT BONA after you pass a grid (SARIG) or a slit (SEDEK) which means you get a rather big amplitude of the light wave in the middle (straight ahead) , and in other angles as well. > happened, because I thought I was flashing the paper, and it shone > through). That created dark spots in her vision that took two days to go > away (thankfully, without permenant damage). LASER which is used for distance measurements (MATAL- MAD TVACH LASER) is known to have cause permanent damage to eyesight, when a person watched it through an eyepiece (MISHKEFET). > > I know that when a laser is marked as "eye safe", it simply means that > standard reflex will shut your eye before permenant damage is done, not > that it won't hurt your eye. > Special safety glasses which are designed for a special strong IR laser are only made in order to last for a second or so- enough for you to come to your senses and get out of its way. -- Orna. | http://tx.technion.ac.il/~agmon A cat has claws at the end of its paws. A sentence has a pause at the end of its clause. ================================================================= To unsubscribe, send mail to [EMAIL PROTECTED] with the word "unsubscribe" in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
