Why are some objects black but highly reflective?

Black can also be reflective, because the shiny of black is not white, as long as it is black enough, it can be reflective.

I think it's mainly because it's already black and shiny.

Because it's just black, but it's very smooth on the surface, that's why it's reflective.

This may be due to the strong incident light, or the slippery material of the object.

This is mainly because it is relatively smooth, so it is easier to reflect.

Because the surface of these objects is smooth and reflective.

Black is just its color, reflectivity is how smooth it is, and the two are different concepts.

The main reason is that because it is relatively smooth, it is easier to reflect.

Of course, white objects will have stronger reflective ability, because when shooting a lot of ** or TV series, they will be lit by white cardboard, so the reflective ability of the whiteboard is stronger.

White objects are more reflective. This is because white objects reflect all colors, so they are particularly reflective.

White, because the white object has absorbed all the light, it is easier to reflect, and the speed of reflection is fast.

White. The most reflective objects are highly reflective scenes, such as white or light-colored scenes; Scenes with low reflectivity are weak in reflectivity; Black objects do not reflect light.

The strong reflectivity is the scenery with high reflectivity, such as the reflection rate of white snow is 98%; The weak reflectivity is the low reflectivity of the scene, such as the reflectivity of carbon black is 2%; In general, there are not as many objects with high reflectivity as there are objects with low reflectivity in the photographable subject, and the average reflectivity is about that, so it is "neutral gray".

Experts know through experiments that the reflectivity of white and yellow people is about 18%, as a manifestation of the "people-oriented" photography principle, the stipulation of camera metering is to define the reflectivity of 18% as the so-called "standard gray" slightly higher than the "neutral gray". The camera metering system treats the reflectivity of all the different substances in the metering area as a standard gray with a reflectivity of 18%.

Regardless of whether it is sunny or cloudy, the metering point displayed on the computer screen** and the 18% gray board** will have the same brightness visually. According to the results of the experiments, which may not be precise enough, this luminance value is expressed in color scales (i.e., 148) and gray levels (i.e., 58%); Histograms of levels on camera and Photoshop, with an intermediate level value of 128 and a gray level of 50%, with little difference.

Because theoretically an object that is absolutely not reflective (reflectivity is 0) is what it is called"Blackbody", which does not exist in reality, so any object on Earth will be reflective, including black.

Coal is black because it absorbs almost all the visible light projected onto its surface, and it has a strong ability to open and glow when burned, so coal is an excellent fuel for humans. A large number of facts have proved that the darker the object, the greater its ability to absorb visible light, and the stronger its ability to radiate light after heating. Among the luminous bodies, there is an object that absorbs all the visible light projected onto the sail on its surface, and neither reflects nor transmits, and the object with this property is called an absolute black body.

The so-called absolute black body refers to an object that is capable of absorbing all the energy of any wavelength radiating to its surface at any temperature. The reflectivity is 0. Theorizing, in fact, there is no such thing as absolute blackbody and black.

Black objects only have less reflectivity to more light in the visible frequency domain, but they are by no means blackbodies. So any object on Earth will be reflective, including black.

Black objects have low reflectivity, and they appear black against the background of surrounding objects with high reflectivity. However, some coal has a cleavage plane with complete cleavage, and specular reflection occurs on the cleavage plane, so such coal can see which side is bright and shaky from different directions in the direction of the reflection of light from which cleavage plane. (Just like the principle that things with low reflectivity, such as glass and water, are bright when viewed from a certain direction.)

Note: Any physical object will reflect a portion of the light, absorb a portion of the light, and transmit a portion of the light. It's just that the proportions are different for different objects.

You're talking about bold. I'll tell you. A blackbody is an idealized object that can absorb all electromagnetic radiation from the outside, that is, from the wireless capacitive to the gamma wave, and there will be no reflection or transmission, lz.

If I put it another way, it is, a blackbody has an absorption coefficient of 1 and a transmission coefficient of 0 for electromagnetic waves of any wavelengthBut comrade, a black body is not necessarily black, even if she can't reflect any electromagnetic waves, but it can emit electromagnetic waves... Note that the wavelength and energy of this electromagnetic wave all depend on the temperature of the blackbody, and do not change due to other factors.

A black body looks black at 700 K or less, but because the radiation energy emitted by a black body below 700 K is very small, the wavelength of light is within the visible light. If the temperature of the blackbody is still rising at 700k, the blackbody is no longer black, it will start to turn red... The temperature is different, the color is different, and the wavelength is different, so the process of absorbing and emitting electromagnetic waves from the black body follows the spectrum, so this trajectory is called Planck trajectory.

Don't overcomplicate it, blackbody radiation is actually thermal radiation of a blackbody.

Not contradictory Because black absorbs light, but also reflects light, only reflects black light, but we can't see other light, so it is said that black objects do not reflect any light.

Matter develops color because it reflects light of different colors. Completely black objects absorb all light.