What's the difference between red and blue?

Question

Why are red things red and blue things blue?

You are all saying that red things reflect red light etc. I know this. The question is why do red things reflect red light?

Answer 1

because...the colour red is red..and the colour blue is blue...do you understand that....hope you do..cos i got out all my encylos and other big fat books...just to come up with this answer

Answer 2

Answer the question easily

Light contains all visible colours.

When you look at something, you see its form, its texture and its colour.

The colour seen by your eye is the part of light energy that is reflected back off the object you are observing.

The other colours (energy) have been absorbed by the object, and are not reflected into your eye.

So looking at a red car, you see red light, because the other colours (blue, yellow, green, violet, etc) have been absorbed by the car's paint.

Question to you: what coulour are the blue and red cars at night under street lamp light?

Answer 3

You see the particular frequency of light that reflects from an object. For example a Stop sign absorbs green and blue light, but red light bounces off. That extra red light hits your eye, so the Stop sign appears red.

Red light is different than blue light because of the "frequency" of the light.

Your eyes receive different wavelengths of light like a radio can receive different radio stations (which are different wavelengths of radio waves). Lower frequencies are more red, higher frequencies blue and violet, with yellow and greens in between.

Answer 4

Red things are red because their surface reflects more red light than other colors of the spectrum. Blue things, similarly for blue light.

Red light has a wavelength of between 630 and 720 nanometers, and blue light has a wavelength between 450 and 500 nanometers, approximately. A nanometer is one billionth of a meter, or about one millionth of a millimeter.

The perception of color is a complex phenomenon, which depends on more than just the wavelength of the light scattered from a given object, because your brain assigns color values depending on the entire visual field seen by your eyes.

Answer 5

Light from the sun contains all the colors. If it goes through a prism it is split like a rainbow.Light can be any color.
Objects are the color that they reflect. A red object absorbs all the colors but red. A blue object absorbs all the colors but blue which it reflects.

Answer 6

Red things absorb short wavelengths and reflect long wavelengths.

Blue things absorb long wavelenghts and reflect short wavelengths.

Your eye has sensitive cells that respond to short wavelengths, and others that respond to long wavelengths. (It also has a third type of cell that responds to medium wavelengths ... greens ... but we can ignore those from the point of view of your question).

So by knowing how much of these two types of cells are stimulated, the eye can tell if the object is reflecting long or short wavelengths. If the light coming from an object contains long wavelengths, we call the object "red." If it contains short wavelengths we call the object "blue."

Answer 7

About .25 micrometers of wavelength.
Red things reflect red light into your eye, thus appear red.
Blue things reflect blue light into your eye and appear blue.

Answer 8

Red is any of a number of similar colors at the lowest frequencies of light discernible by the human eye. Red light has a wavelength range of roughly 630-760 nm. Lower frequencies are called infrared, or below red.

Red is an additive primary color, complementary to cyan. It was once considered to be a subtractive primary color, and is still sometimes described as such in non-scientific literature; however, the colors cyan, magenta and yellow are now known to be closer to the true subtractive primary colors detected by the eye, and are used in modern color printing.

— Color coordinates —
Hex triplet #FF0000
RGBB (r, g, b) (255, 0, 0)
CMYKH (c, m, y, k) (0, 100, 100, 0)
HSV (h, s, v) (0°, 100%, 100%)
B: Normalized to [0–255] (byte)
H: Normalized to [0–100] (hundred)

Blue is any of a number of similar colors. When it is a pure color from a single source, it corresponds with a wavelength range of about 420–490 nanometers. It is considered to be one of the three primary additive colors in RGB system; blue light has the shortest wavelength range of the three additive primary colors. The English language commonly uses "blue" to refer to any color from navy blue to cyan.

— Color coordinates —
Hex triplet #0000FF
RGBB (r, g, b) (0, 0, 255)
CMYKH (c, m, y, k) (100, 100, 0, 0)
HSV (h, s, v) (240°, 100%, 100%)
B: Normalized to [0–255] (byte)
H: Normalized to [0–100] (hundred)

Answer 9

Red is light with a longer wave-length than blue - stimulates different *rods* in the brain's visual area.

Wrulf Gunkl VonGlashaus-Steinberger

Answer 10

red is red and blue is blue, they look different