Importance of Light!! đź‘Žđź‘ŽHarmful & Beneficialđź‘Ťđź‘Ť

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 The importance of light is not only based on the things that are beneficial. Harmful effects are also related to its importance but, it only takes place when we abuse it and sometimes gets too carefree. Until then, we should learn to value and properly use things given to us. We should not take things for granted.

Harmful Effects đź‘Žđź‘Ž

💢💢 Common Sense NEEDED!! ⚠⚠⚠

  • When looking towards a bright light directly, Don’t stare at it for too long because you might get blinded.
  • Since the Sun is a source of light, of course it can cause some harm to us. The sun produces the Harmful Ultraviolet Rays. (â„ą. U.V. Rays)
  • Sometimes, The harmful effects of visible light depend on the intensity of light radiation. It can cause skin burn or even intense skin cancer. Use your brain and get Sun blocks.! These are good ways of avoiding harsh effects on skin.

Beneficial Effects đź‘Ťđź‘Ť

💬💬 Bottom Line

  • Without light, there would be no sight.
  • SunLight powers all life on earth, either directly or indirectly. It gives us warmth.
  • Light is crucial to life. John wrote about Jesus when he said, “In him was life; and the life was the light of men.” (John 1:4) Light chases confusion away. The previous verse says, “All things were made by him; and without him was not any thing made that was made.” (v.3) Jesus Christ is the creator.

FACT !!

Existence of light for us is self-evident. Therefore, we often forget its central role in our own wellbeing and for all life on the planet.
Light is almost like air. It’s a given. A human would no more linger over the concept of light than a fish would ponder the notion of water.

The Importance of Light can be read more on The sites Below 👇👇⤵⤵⬇⬇⏬⏬

——-> http://www.valkee.com/blog/2013/06/have-you-thought-about-the-importance-of-light-for-life/

——-> http://science.nationalgeographic.com/science/space/universe/power-of-light/

Refraction: The Bending Of Light

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Refraction is the bending of a light ray as it passes at an angle from one transparent medium to another. As a beam of light enters glass at an angle, it is refracted or bent. The part of the light beam that strikes the glass is slowed down, causing the entire beam to bend. The more sharply the beam bends, the more it is slowed down.

 Each color has a different wavelength, and it bends differently from all other colors. Short wavelengths are slowed more sharply upon entering glass from air than are long wavelengths. Red light has the longest wavelength and is bent the least. Violet light has the shortest wavelength and is bent the most. Thus violet light travels more slowly through glass than does any other color.

Like all other wave phenomena, the speed of light depends on the medium through which it travels. Light travels faster through hot air than it does through cold air. As light travels from one transparent material to another it bends with a different refraction. The road’s hot surface both warms the air directly above it and interacts with the light waves reaching it to form a mirage. In a mirage, reflections of trees and buildings may appear upside down. The bending or refraction of light as it travels through layers of air of different temperatures creates a mirage.

Read More on this link  ———————————————————————————————————————————————————————->>>>> http://science.jrank.org/pages/1591/Color-Refraction-bending-light.html

Perception of Light

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Perception

  • Understanding or awareness gained through the use of senses
  • Take in with the mind; discern

—–

The human eye is composed of many parts, all of which together to convert the light rays that are going through the pupil of our eye into information that the brain can then interpret.

Light rays travel and bounce off objects before they get to the pupil, that’s what determines the color and brightness that the brain perceives. Thanks to this complicated process, we perceive, and are aware of that surrounds us.

—– ROD CELLS AND CONE CELLS

Light that enters the eye through the pupil ultimately strikes the inside surface of the eye known as the Retina. The retina contains a variety of light sensing cells known as rods and cones.

Rod cells are sensitive to the intensity of light, they cannot distinguish between lights of different wavelengths. The rods perceive light during the night-time and enables us to see in black and white.

Cone cells are the color-sensing cells of the retina. When a light of a given wavelength enters the eye and strikes the cones of the retina, a chemical reaction is activated, resulting to an electrical impulse that is sent along nerves to the brain.

—– KINDS OF CONE CELLS

It is believed that there are three kinds of cone cells. These three are referred to as the red, green, and blue cone cells. They are called this way because of their respective sensitivity to the wavelengths of light associated with the colors red, green, and blue.

Red cone is sensitive to a range of wavelengths, it is not only activated by wavelengths of the red light, but also by the wavelengths of orange light, yellow light and green light.

Green Cone is most sensitive to wavelengths associated with the color green. Yet, it can also be activated by wavelengths related with the color yellow and blue.

—– HOW THE EYE FOCUSES đź‘€

At the very back of the eye, there can be found a curved and light-sensing layer called the retina. The retina senses light rays and acts as a messenger to the brain. The brain, in turn, translates the information it receives into images.

Three things happen when you look at something:

1- The image is cropped to fit onto the retina

2- Scattered light rays come together (or focus) on the retina

3- The image is bent to match the curve of the retina

A lens, located between the retina and the pupil, enables the eye to achieve there three things. This lens, which is thickest at the center, works together with the top layer of the eye, the cornea, to focus the image onto the retina.

🔛🔛  F A C T !! 🔛🔛

Color can be thought of as a physiological and psychological response to light waves of a specific frequency or set of frequencies impinging upon the eye. A n understanding of the human response to color demands that one should understand the biology of the eye.

Brightness and Color

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⛔ the DISTANCE of the receiving surface from the source

Some of us may have noticed that a light source appears to be brighter when we are near and dimmer when farther away. This is because the amount of light that enters our eye increases as we move closer to the light source.

â›” the BRIGHTNESS of the source or LIGHT INTENSITY

Brightness / Intensity

⬜ strength/degree/ amount of quality

⬜ refers to the energy it carries over an area per unit time; amplitude of wave is related to it.

Brightness-is an attribute of visual perception in which a source appears to be radiating or reflection light. In other words, brightness is the perception elicited by the luminance of a visual target.

  • Words-is the visual perceptual property corresponding in humans to the categories called red, orange, yellow, green, blue, indigo, and violet.

Color

-appearance of something apart from size and shape when light strikes it

–physiological aspect of objects caused by differing qualities of light emitted or reflected by them

We all know that white light or the color white is not a color at all. It simply is, the combination of the bands of color from the visible spectrum because it has all he colors of the rainbow. It is composed of different colors of varying frequencies and wavelength.

Combining the primary colors of light (blue, red, green), creates the secondary colors (cyan, magenta, yellow). All the other colors can be broken down into different combinations of the three primary colors.
400px-AdditiveColor_svgcolors

[ Characteristics of Color ]

♦♦ Hue ——>> represents the observable visual difference between two wavelengths of color

♣♣ Saturation ——>> richness or strength of color

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Radiation Curve —–>>> a graph showing the distribution  of colors based on brightness against the wavelength

radiation curve

Visible Spectrum —–>>> bands of color that compromises the visible light

Black_body_visible_spectrum
spectrum

FACT !!

Objects appear one color or another, because of how they reflect and absorb certain colors of light.

Facts about LIGHT!

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Light travels at a speed of about 300,000 km/s.
The sunlight that we see here on Earth actually left the Sun 10 minutes before.
During photosynthesis, plants use light energy to create chemical energy.
UV lights are often used by forensic scientists to see details that are not seen by the naked eye.
Although humans cannot see UV light, some insects have the ability to see it.
Optics is the study of light.
The speed of light changes when traveling through different objects.
Light is a type of electromagnetic energy.
Light is made of tiny photons which contain lots of energy.
The intensity of photons is dependent upon the amount of energy they contain.
Space is dark because light is only visible when it has an object of which to bounce off.
Light energy is always moving and can therefore not be stored.
Light is also called electromagnetic radiation when speaking of light other than visible light.
Of all the forms of radiation and light on the electromagnetic spectrum, humans can only visibly see a very small amount of light.
The reason we see different colors of light is because each color has a different wavelength.

Composition Of White LIGHT

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White Light is composed of all the wavelengths of the electromagnetic spectrum.

Each color of the spectrum represents light vibrating at a different Frequency or wavelength.

In 1665, Sir Isaac Newton conducted and demonstrated his theory for the composition of light.

He experimented in a Dark room where he allowed a narrow beam of sunlight to pass through a tiny hole..

A triangular prism was placed in the path of light.

After the light passed through the prism, the light split into different colors.

  • Dispersion ——>The separation of COLORS from white light as it passes through a prism.

 Light_dispersion_conceptualRed Light- it has the longest wavelength that’s why it is bent least than the others.

Violet light- shortest wavelength causing it to be bent the most.

Newton hypothesized that when a selected color passes through a tiny hole directed to another prism, the color will be separated further. However, this assumption of his, was incorrect. It was because when the selected color  passed through another prism, it became white light again..  

Newton therefore concluded that white light is a “heterogeneous mixture of Different refrangible rays.” 

What is LIGHT?

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Light is a type of energy known as electromagnetic radiation. It is given out by hot objects such as the Sun, light bulbs, and LASERS. When light hits a surface, its energy can be absorbed (soaked up), REFLECTED, or deflected by REFRACTION.
Light is made up of little packets of energy called photons. Most of these photons are produced when the atoms in an object heat up. Heat “excites” the electrons inside the atoms and they gain extra energy. This extra energy is then released as a photon. The hotter an object gets, the more photons it gives out.