It seems odd that changing the speed of light should change its angle – it’s because, rather than moving in a straight line, light moves in waves. Part of the wave is slowing down before the rest has done so. Some people compare this to driving a car off the road at an angle – if the left front wheel hits dirt and slows down while the right wheel is still on bitumen, the car will swing to the left.

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Most premium AR lenses include a surface treatment to seal the anti-reflective layers and make the lenses easier to clean. These treatments also repel water so you won’t get water spots on your lenses. Some lens surface treatments repel both water and oil from your skin.

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This is also why, if you hold a magnifying glass above the ground on a sunny day, you may see a bright spot form. Just as with light coming from other objects, the magnifying glass can concentrate light from the sun.

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Light travels at different speeds through different substances. It goes slightly slower through glass and plastic than it does through air.

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Most regular plastic lenses reflect about 8% of the light hitting the lenses so only 92% of available light enters the eyes. AR coating eliminates almost all reflections so up to 99% of light passes through your anti-glare glasses and reaches your eyes.

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A magnifying glass is usually a convex lens (a lens that bulges outwards), made of either glass or plastic. Light hits the glass at an angle, and it gets refracted towards the centre of the lens. Leaving the glass makes it refract even further, meaning, at some point, these rays of light converge together.

Because sunlight is much stronger than ambient light, this can be quite dangerous – the magnifying glass can concentrate sunlight enough to set things alight. Make sure never to do this near flammable objects, and don’t leave your magnifying glass lying around outside on total fire ban days.

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This speed difference isn’t obvious to the human eye. But it does have another noticeable effect: it can change the angle at which light is travelling. This is referred to as refraction, and it happens as long as the light is hitting the glass at an angle other than 90°.

The more light that reaches your eyes, the better you can see. Anti-reflective coating (also called “AR coating” or “anti-glare coating”) decreases the amount of light that is reflected off the front and back surfaces of your eyeglass lenses. This lets more light pass through the lenses and reach your eyes.

concave, v. meanings, etymology, pronunciation and more in the Oxford English Dictionary.

What exactly is magnification? A basic definition of magnification is the ratio of the size of a specific feature of an object or sample as seen in an image ...

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The majority of lenses with anti-reflective coating have a very light tint, which is usually green or blue. The color depends on the brand of coating that’s on your lenses.

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Light is critical for good vision. When light enters your eye, it hits the retina — the light-sensitive layer of tissue at the back of the eye. Photoreceptors cells in the retina turn the light into electrical signals. Those cells send the electrical signals to the optic nerve, and the optic nerve sends them to the brain. The brain turns those signals into the things you see.

You want your glasses to give you the best vision possible. Adding anti-reflective coating to your lenses is one way you can optimize your vision.

What is aperture in photography? ... Aperture refers to the opening of a lens's diaphragm through which light passes. It is calibrated in f/stops and is generally ...

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The exact formula of anti-reflective coating depends on the company that makes it. In general, AR coating is made of many very thin layers of metal oxides that are applied to the lens surface. The layers alternate between high and low refractive indexes (the refractive index measures how the lens refracts — or bends — light). The more layers there are, the less amount of light that’s reflected onto the lenses of your anti-glare glasses.

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Anti-reflective coating has many benefits, but it is an add-on so your anti-glare glasses will cost more. If you’re considering it, talk to your eye doctor so they can help you decide if it’s worth it for you.

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AR coating is especially beneficial on high-index lenses. These lenses are thinner and lighter than regular plastic lenses. They can reflect up to 50% more light than regular plastic lenses so less light reaches your eyes.

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Our lasers range from Spectra-Physics lasers for industrial and research applications to tunable lasers from New Focus, laser diode modules and HeNe lasers.

A magnifying glass is a great thing to bring on a summer evening walk – you can use it to examine bugs, stones, leaves and anything else you see that warrants some close attention.

If you’ve held up a glass in front of a cool leaf (for instance), the light from the leaf is getting concentrated, rather than dispersed as it would ordinarily. If you put your eye at the right spot in front of the glass, you’ll see a larger image of the leaf.