20 surprising facts about light

Light is an amazing phenomenon, it literally and figuratively illuminates our lives in many ways. The UN declared 2015 the International Year of Light to demonstrate to the inhabitants of the Earth the importance of facts about light and optical technologies in life, for the future, and for the development of society.

Here are some interesting facts about light that you may not have known about.


1. The sun is actually white when viewed from space, as its light is not scattered by our atmosphere. From Venus, you will not see the Sun at all, because the atmosphere there is too dense.

2. People are bioluminescent 

Due to metabolic reactions, but our luminescence is 1000 times weaker than can be seen with the naked eye.

3. Sunlight can penetrate about 80 meters deep into the ocean. If you descend 2000 meters deeper, then you can find a bioluminescent monkfish, which lures its victims with glowing flesh.

4. Plants are green because they reflect green light and absorb other colors for photosynthesis. If you place a plant under green light, it will most likely die.

5. Aurora and Aurora Borealis occur when the “wind” from solar flares interacts with particles in the earth’s atmosphere. According to Eskimo legends, the aurora is the soul of the dead who plays football with the head of a walrus.

6. In 1 second, the Sun emits enough energy to provide the entire world with it for a million years .

Interesting facts about light

7. The longest-burning lamp in the world is a centenary lamp in the California fire department. It has been burning continuously since 1901.

8. The light sneeze reflex, which causes uncontrollable bouts of sneezing in the presence of bright light, occurs in 18-35 percent of people, although no one can explain why it occurs. One way to deal with it is to wear sunglasses.

9. In a double rainbow, the light is reflected twice within each drop of water, and the colors in the outer rainbow are reversed.

10. Some animals see light that we cannot see. Bees see ultraviolet light , while rattlesnakes see infrared light.

11. Niagara Falls was first electrically illuminated in 1879, and the lighting was equivalent to 32,000 candles. Today, the illumination of Niagara Falls is equivalent to the illumination of 250 million candles.

12. When light passes through different substances, it slows down and refracts. Thus, the lens focuses the rays at one point and can set fire to the paper.

The laws of light

13. Light has impulse. Scientists are developing ways to use this energy for long-distance space travel.

14. The frog’s eyes are so sensitive to light that researchers in Singapore are using them to develop incredibly accurate photon detectors.

15. Visible light is only part of the electromagnetic spectrum that our eyes see. This is why LED bulbs are so economical. Unlike incandescent bulbs, LED bulbs only emit visible light.

16. Fireflies emit a cold glow through a chemical reaction with 100% efficiency. Scientists are working to simulate fireflies to create more efficient LEDs.

17. To study how our eyes perceive light, Isaac Newton inserted needles into the eye socket. He tried to understand whether the light is the result of something that comes from outside or from within. (Answer: Both assumptions are correct since the rods in the eyes respond to specific frequencies).

18. If the Sun suddenly came to an end, no one on Earth would have noticed it for another 8 minutes 17 seconds. This is the time it takes for sunlight to reach Earth. But don’t worry, the sun has another 5 billion years of fuel left.

19. Despite the name, black holes are actually the brightest objects in the universe. Despite the fact that we cannot look beyond the event horizon, they can generate more energy than the galaxies in which they are located.

20. A rainbow occurs when light meets water droplets in the air, refracts and reflects within the droplet, and refracts again, leaving it behind.

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