The Truth About Blue Light: Is It Really Harmful?

In today’s digital age, we’re constantly connected to our devices. From the moment we wake up to the time we go to bed, we’re checking emails, scrolling through social media, or binge-watching our favorite shows. But have you ever stopped to think about the blue light these screens emit and its effects on our health?

What is Blue Light?

Blue light is a type of visible light with a wavelength between 400 and 450 nanometers. It’s perceived as blue in color, but it can be present even when light appears white or another color. Our main source of blue light is sunlight, but it’s also emitted by LEDs and is prevalent in the screens of our electronic devices¹.

The Blue Light Debate

There’s been a lot of discussions lately about whether the blue light from our devices is harmful. Some studies suggest that exposure to high-energy blue light can damage our eyes and disrupt our sleep patterns. However, the amount of blue light from devices like smartphones, tablets, and laptops is not considered harmful to the retina or any other part of the eye².

Blue Light and Sleep

While blue light may not cause physical harm to our eyes, it can have an impact on our sleep. Exposure to blue light, especially at night, can suppress the release of melatonin, the hormone that signals our brain it’s time for bed. This disruption can lead to difficulty falling asleep and overall poorer sleep quality³.

How to Protect Yourself

If you’re concerned about blue light exposure, there are several steps you can take to protect yourself:

• Use “night mode” settings on your devices, which reduce blue light emission.
• Take regular breaks from screens to give your eyes a rest.
• Avoid using devices right before bedtime to help maintain your natural sleep cycle.

Conclusion

The blue light emitted by our devices is a topic of ongoing research. While it’s not deemed harmful to our eyes, it can affect our sleep. By being mindful of our screen time and taking simple precautions, we can enjoy our devices without compromising our health.

References

• “Blue Light of the Digital Era: A Comparative Study of Devices” – MDPI
• “Blue Light and Eye Damage: A Review on the Impact of Digital Device Emissions” – MDPI².
• “Blue Light: What It Is and How It Affects Sleep” – Sleep Foundation³.

Why Gold has the colour it has??

Gold as everyone knows is a noble metal sought after by everyone. By being noble means it is resistant to chemical reactions like corrosion by air and water combination.

The answer to the question why it has the colour it has lies in electronic configuration of gold atoms.  Its electronic configuration is [Xe] 4f14 5d10 6s1 where Xe stands for Xenon. The outermost orbitals are 5d and 6s.  There is one electron in the outermost shell. In the geometric structure, atoms are arranged in a particular config And the lone electrons present the 6s orbitals are diffused in the lattice which means that individual electron in a atom has lost the address of parent atom and now belong to the community of gold atoms.

How do the objects we see have different colours? Colours are hidden in white light emanating from the sun. The visible spectrum of light components is composite of 7 colours remembered using “VIBGYOR” where V is for violet and has the maximum energy in the visible spectrum and R is for red with lowest energy.

When it falls on an object, the object absorbs some fraction of the light and reflects the rest of it. Which color or colors wavelengths it will absorb depends upon the unique structure of the object molecules. We see the resultant of colours which are reflected.

In case of gold, the energy difference between the 5d and 6s levels is 2.7 electron volts. The blue light has exactly this energy in its photon packets. So when light falls on it, it completely absorbs the blue fraction of the light. The remains reflected resultant light is exactly the colour which is that of gold.