Why can't black light be produced?

Question

Like a bulb with black light ?

Answer 1

when you say blacklight, you mean that a torch that throws a black image on something right?



thing is that black indicates the absence of light, or the absence of light energy

so if i switch on a black light and shine it on a wall, i expect to see, in a bright room a black patch on the wall!

this means that all the light coming from that patch must not reach into my eyes and should instead go into the torch itself,



as of now a device which can pull light into itself doesnt exist!

and the physics as of now, doesnt say it can be made in the future



the only thing capable of pulling light is a blackhole, not possible to have one in a flashlight!

Answer 2

Can Light Be Black

Answer 3

You wouldn't be able to see it. Colors are seen when an object absorbs all of the visible spectrum of light save for a specific wave length, which is reflected back and seen as a specific color. For example, a red object reflects only the red wavelength of light. The color black occurs when an object absorbs all of the visible spectrum of light, reflecting no color at all. When this is applied to light itself, the reasons are clear. When you see colored light, the light is in the wavelength of that color. For it to be truly black, it would have to be in a wavelength outside the visible light spectrum and therefore would be imperceivable to the human eye. On the other hand, there are "black lights" that are actually ultraviolet lights. These transmit ultraviolet light and a portion of the violet end of the spectrum. Since the color violet can be seen, it can't truly be black.

Answer 4

Black is the absence of light so you obviously cannot produce it by shining light. The reason we can see black is that there is some reflection from black surfaces, they are not truely black.

Try closing yourself in a light tight room to see --- nothing, true black.



GL>

Answer 5

To be very specific, if you go through the spectrum, clearly you dont find any specific wavelength for the BLACK.

You should know light emitted is a result of the emission of visible wavelengths, & black is NOT one of them.A body appears black if it absorbs all the wavelengths without emitting any, ideally, like Black body.

Answer 6

Black is the absence of illumination... therefore black can be produced by simply not turning the light on - think of your TV - white, red, green, blue, dots are generated in combinations to create the colors. Black is generated by not generating any of the colors.

Answer 7

definition of true black = absence of light; so 'black light' is an oxymoron, like the 'living dead'

-what most people call black light (ie glow in the dark bowling, crime investigation shows, etc) is actually mostly UV (ultraviolet) light, and is only seen by us when it reflects off of a few particular substances



hope this helps

Answer 8

we see an object black when it emits no light...just as we see any object white when it emits lights of all visible frequencies....so black is not a colour..its the sensation our brain feels when ther is no light..so there is no black light...though some disco lights emit near UV frequencies and hence they are called black lights..but they arent black really..

Answer 9

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Answer 10

You can take a look optics.