It is a hard anwser to find!!!!help I want to win the question of the week.
2007-01-02 12:33:19 · 9 answers · asked by J T 1 in Science & Mathematics ➔ Physics
Mainly, laser light is coherent, but light from a flashlight isn't. Coherence means that all the light from a laser are 'in phase', that is, if u take a cross section at some distance from the source, the electric field direction and magnitude is the same everywhere at that section.
Secondly, laser light usually has a select group of wavelengths alone (eg., Ar ion laser is mainly tuned to get 488 nm light), but flashlights, which are usually incandescent sources, emit a continuous range of wavelengths.
Thirdly, laser light souces can be made to produce light of very high intensity whereas flash lights use parabolic reflectors to give a reasonable collimation, but nowhere near that of lasers.
2007-01-02 12:43:32 · answer #1 · answered by Venkat 3 · 1⤊ 0⤋
The light from a laser is coherent, which means that the waves of the light in the laser all all of the same wavelength and are moving in step. For the flashlight, there are many different wavelengths and the individual waves are out of step with each other.
2007-01-02 12:35:35 · answer #2 · answered by mathematician 7 · 1⤊ 0⤋
The light from a flashlight is scattered easily from dust from the air. A flashlight works with lightbulbs also. A laser however, works muchlike sunrays. Light is flashed through a magnifying glass to produce intense heat on an object.
2007-01-02 12:41:04 · answer #3 · answered by John 1 · 0⤊ 1⤋
LASER is an acronym for light amplification by stimulated emmissiion of radiation.
When light at all one amplitude is matched crest to crest and trough to trough it magnifies as the crests add up. This type of light can go on forever until it runs into something. We have sent it to the moon. It can cut steel.
In a flashlight all the beams are different amplitude and going in all directions.
2007-01-02 12:39:10 · answer #4 · answered by science teacher 7 · 0⤊ 0⤋
Hi. Laser light has one uniform frequency and a flashlight has a wide spectrum of light frequencies.
2007-01-02 12:36:05 · answer #5 · answered by Cirric 7 · 0⤊ 0⤋
Lasers emit one wavelength of light, and in only one direction. Flashlights, emit a variety of wavelengths that radiate out in all directions.
2007-01-02 12:36:10 · answer #6 · answered by Titainsrule 4 · 0⤊ 0⤋
#1 Powerful Tactical Flashlight : http://FlashLight.uzaev.com/?KiiN
2016-07-11 08:00:53 · answer #7 · answered by Vonda 3 · 0⤊ 0⤋
Flashlight is white light in full spectrum whereby laser light is one color/frequency in phase.
2007-01-02 12:37:28 · answer #8 · answered by kellenraid 6 · 0⤊ 0⤋
shine them both in your eye and find out
2007-01-02 12:35:17 · answer #9 · answered by Z 4 · 0⤊ 2⤋