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Emission spectroscopy is used to measure the photons released when an electron falls to a lower energy level after becoming excited. The emission spectrum of a certain material is shown by a black band with separated coloured lines. These colours lines are the parts of the spectrum where photons have been released from the electrons when they fall to a lower energy level.

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Several recommended eyeglass sprays, designed to wash away particles without harming your lenses, are available wherever eyewear products are sold. Avoid using standard household glass cleaners like Windex or Glass Plus. These products clean glass very well but contain ammonia or other detergents that can wear away plastic lenses, frames, and the coatings on glass lenses. Soap and water is a cleaning standard and a fine combination to use on lenses. Just be sure the soap you use is free of harsh detergents.

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The best material for drying or wiping down lenses is a microfiber cloth. You’ll find these in the eyewear section of stores or at optometrists’ offices. You may have found one included in the case when you purchased your glasses and there’s a reason why it was there. Microfiber is comprised of small nylon and polyester fibers that are designed to prevent scratches. Just be sure to use a microfiber cloth in conjunction with water or an eyeglass spray. If particles are present on your lenses, even microfiber cloths will grind them into the surface.

You want your eyeglasses to serve you as long as possible. Keep them clean and scratch-free with a little caution, a little care, and the proper materials.

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There are two types of emission spectroscopy: line and continuous. When the spectrum is shown as lots of lines separated by black spaces, it is a line emission spectrum. When the spectrum is shown as lots of colours in one particular wavelength, it is a continuous emission spectrum. Emission spectroscopy is used to identify a substance because the energy released when the electrons fall back to their ground state is different for every substance.

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The use of some form of fluid is essential to scratch avoidance. Scratches often occur because minute particles on the lenses are ground in when you wipe your glasses. Fluid acts as both a cleaner, removing these particles, and a lubricant, reducing friction when you wipe.

Few things can be as annoying as wearing a pair of scratched or scuffed glasses. Those tiny scratches seem harmless enough at first, but group enough of them together and peering through them is like staring through a dense fog. Even a single scratch, if gouged deeply enough or in the wrong place, can significantly impact your vision and also cause eye strain.

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Electrons don’t like being in an excited state. This means that after becoming excited and moving to a higher energy level, they soon fall back to their original energy level. However, to do this, they have to release a packet of energy – this is called a photon. The size of the photon released is exactly equal to the size of the jump the electron had to make in the first place.

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The second part of the equation is the use of a proper cloth. You may think a quick wipe down with your shirt tail is harmless enough, especially if the material is made of cotton, but clothing traps small dirt particles and you’re rubbing them into your lenses. Also, the detergents and fabric softeners used to wash clothes can be harmful to lenses, frames, and coatings. Even tissues and soft paper towels can cause damage. They seem soft enough to the touch, but can contain abrasive fibers that are destructive to lenses over time, and just like clothing, they collect dirt and dust particles.

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Modern scratch-resistant coatings go a long way in protecting plastic lenses, and glass lenses are naturally scratch-resistant, but let’s face it – our glasses endure daily, real-world use, and scratches happen with improper use or storage. You may be surprised to learn, however, that one of the prime culprits of scratched eyeglasses is a routine task: cleaning them. It has to be done, but done correctly; improper cleaning often results in irreversible lens damage.

Absorption spectroscopy is a technique used to measure the absorption of energy. The absorption spectrum of a certain material is shown by a continuous band of colour with black lines between them. The coloured parts represent the total light that is focused on the material. The black lines show an absence of this light – these are the parts of the spectrum where the electrons have absorbed the light photons.

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There are two types of absorption spectroscopy: atomic and molecular. Atomic absorption spectroscopy is the method of producing a spectrum when free atoms absorb different wavelengths of light – this is usually used for gases. Molecular absorption spectroscopy is the method of producing a spectrum when whole molecules absorb different wavelengths of light (usually ultraviolet or visible).

Electrons can only exist in discrete energy levels (these can also be called electron shells) – they can’t exist halfway between. The lowest energy level that an electron can be in is called the ground state. For an electron to move from a lower energy level to a higher energy level, it must absorb a set amount of energy because energy levels are quantised.  This means that the energy absorbed by the electron must be exactly the same as the energy difference between the two levels.

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Light absorption is the process in which light is absorbed by matter and converted into energy. In an atom, electrons vibrate at a specific frequency – this is called the natural frequency. If a wave of light hits a material in which the electrons are vibrating at the same frequency as the wave of light, the electrons will absorb the energy and convert it into vibrational motion. This is why objects have different colours – different materials’ electrons will vibrate at different rates, and therefore absorb different frequencies of light.

When an electron absorbs energy, is it promoted to a higher energy level further away from the nucleus of the atom and is described as being ‘excited’.