a red light source and a green light source shine on a white screen.?
474846
What colour will what be?\n\nLight is additive: red light plus green light will yield whitish light.  The blue object will still look blue.\n\nIf you mean that the light passes through the blue object onto the screen, all non-blue light will be filtered out, so the spot on the screen will look blue.
573389
it's reactive to light
311737
infrared and ultraviolet!
169210
if the lights on the top right corne are green that mean your connected.  is that what you see
287343
I would probably use Light Emiting Diodes connected to a low voltage dc source using very small gauge twin-lead wire.
985814
I'm thinking it's a power supply in the monitor.  You might want to try another monitor to assure yourself that the problem is indeed with the monitor.
115588
look at a really really bright light
5590
Video projectors projecting ordinary video cassettes must use the same technology as a regular TV screen; many also project TV.  TV's use red, green and blue color electron guns to combine colors to obtain any necessary shade.  Often the guns projected onto the screen through tiny holes in a shield onto the three different colored phosphor dots.  At close range you can see some colored dots even when the screen is black.  Because white (as in sun light) is the presence of all colors (all visible wave lengths) all three guns operate at egual intensity to give white.  Because black is the absense of all color (no visible vavelengths) all the guns emit nil electrons onto the phosphors where the picture is black.  The eye detects black because that is the predominant projection but some color may be emitted just as a radio has audio static.
852018
If your screen showed up white on your laptop then it's not the backlight.  Your screen would be very dark and pretty much impossible to read without a backlight.  Since you tried another monitor and had the same result, or at least that's how I understand it, it sounds like it's a graphics issue.  It's possible that the shock of slamming the lid shut has caused damage to your motherboard.\n\nIf in fact you could see everything when you used a monitor, you very well could have broken a contact on your motherboard, broken a cable, or something entirely more fun than either of these.  You could break out the multimeter and check contacts, but that may prove to be quite tedious.  It seems like your problem is directly linked to the connection of the LCD.  Poke around a bit and see if a ribbon cable isn't seated properly or something else.  I'm not familiar with Dell's method of routing the video signal from the mobo to the screen.  Good luck.
336901
Any three colors (or frequencies) of light which produce white light when combined with the correct intensity!\n\n"White light can also be produced by combining only three distinct frequencies of light, provided that they are widely separated on the visible light spectrum. Any three colors (or frequencies) of light which produce white light when combined with the correct intensity are called primary colors of light. There are a variety of sets of primary colors; yet,the most common set of primary colors is red (R), green (G) and blue (B). When red, green and blue light are mixed or added together with the proper intensity, white (W) light is obtained. This is often represented by the equation below:\n\nR + G + B = W\n\nIn fact, the mixing together (or addition) of these three primary colors of light with varying degrees of intensity can produce a wide range of other colors. For this reason, television sets and computer monitors produce the range of colors on the monitor by the use of of red, green and blue phosphors."
134964
Red because it's a brighter color (traffic lights and cars' brake lights are red)
683801
reduce your light on the screen if no change see an optician they will advise you
340317
The backlight of a laptop is a fluorescent panel driven by a power supply that takes battery power and generates a higher voltage suitable to make the panel light up and vary the light output.\n\nA rough guess is you damaged the fluorescent panel, it's power supply has blown up and since a lot of manufacturers have the power supply up in the lid of the laptop the flexible cable has flexed once too often and broken a wire to the power supply.
759217
Burn it in a sprectrophotometer.  Look at the emitted light.
1158819
Is the LED of the monitor glowing? Is it green or a different color? Is it steady or blinking?\nIf its a relatively new monitor, a message will be displayed if the signal cable is disconnected. If the LED is blinking, then the monitor is connected but not receiving signal from the system. If the LED is steady green, try increasing brightness and contrast. Do you see the monitor's onscreen menu?\nIf the monitor is older than 3 / 4 years you can expect a breakdown.
361367
atach a wire to each part of the batter, attach them to the light. create a circuit and you will have light
309685
A common garden variety TV screen is a Cathode Ray Tube- the screen itself is a phosphor coated glass surface attached to the vacuum bottle and electron gun assembly that makes up the rest of it. In operation the electrons from the gun at the rear of the thing are electromagnetically accelerated to the phosphor screen, and scanned by electromagnetic deflection back and forth over the phosphor, making little dots of light that cumulatively make the "picture"- each dot is a "picture element" or pixel the whole accumulation makes a recognizable image. and if you like I can explain how the thing work in color, too.