Disposable contact lenses, for example, became possible with the arrival of cheap, mass-produced, high-quality plastics—and, if you wear eyeglasses or have a camera on your phone, the lenses will almost certainly be plastic ones. Photo: Plastic lenses, like the one in this magnifying glass...
Magnifying Glasses; How [Pounds Sterling]2.45 Frames End Up Being Sold for [Pounds Sterling]99Daily Mail (London)
Get two magnifying glasses (it works best if one is larger than the other) and a sheet of printed paper. Hold one magnifying glass (the bigger one) between you and the paper. The image of the print will look blurry. Place the second magnifying glass between your eye and the first magni...
Get two magnifying glasses (it works best if one is larger than the other) and a sheet of printed paper. Hold one magnifying glass (the bigger one) between you and the paper. The image of the print will look blurry. Place the second magnifying glass between your eye and the first magni...
If you have by chance never melted green plastic army men, here’s how to do it. 5. Traditional Lenses To create a fire, all you need is some sort of lens in order to focus sunlight on a specific spot. A magnifying glass, eyeglasses, or binocular lenses all work. If you add some...
(Or frying ants, which seems to be the other thing that kids like to do with magnifying glasses.) By forming your target material into an efficient ball, you will be able to start a fire even with very small lenses. Like less than an inch across small. The finer the individual fibres...
in a dark room. Or sitting too close to the television. Or reading without our glasses. All of these actions, we've been told, are supposed to hurt our eyesight. Not so, say eye specialists. Sure, these activities may make your eyes tired, but they can do your eyes no actual damage...
even if most of its light is obscured by the moon. Just as a magnifying glass can focus enough sunlight onto a leaf to start a fire, the lens in your eye can also focus that sliver of light onto your retina to burn it. And because retinas have no pain receptors, you can damage you...
If you have trouble reading, you might try a brighter lamp or a magnifying glass. If glare is a problem for you, check out special glasses that have an anti-glare coating. They can help when you drive at night. Keep close tabs on how your cataracts affect the way you see. When your...
So going back to our magnifying glass example, the Superlaser is like a series of large magnifying glasses focusing the entire power of the reactor (which is like a small sun) into one huge beam to destroy a planet, rather than a few rays of light to burn a leaf. Firing the Superlaser...