The distance from the lens to the principal focus is called the focal length. In a ray diagram, a convex lens is drawn as a vertical line with outward facing arrows to indicate the shape of the lens. They come together at a point called the principal focus.
Parallel light rays that enter the lens converge. Convex lensesĪ convex lens is thicker in the middle than it is at the edges.
Lenses are used in cameras, telescopes, binoculars, microscopes and corrective glasses. When light is refracted it changes direction due to the change in density as it moves from air into glass or plastic. And, if you’re in doubt about any of these details you can always check them against some of the detailed images on the Converse website.Jonny Nelson introduces an animated explanation of lensesĪ lens is a shaped piece of transparent glass or plastic that refracts light.
#Light converse comparison how to#
Watch the video below for even more clues as to how to spot the differences between real Converse All Star shoes and fakes ones. But, it’s also possible that they aren’t genuine if they were sold as new. If your Converse has this then it’s possible they were made before 2008 and are genuine. Shoes that are sold as new stock should not have a an R inside a circle (copyright symbol) underneath the star. It should have the words “Converse” and “All Star” as well as a filled-in 5-point star. The logo on the back of the shoes is also an important place to look for clues. If this is missing then you could have a pair of the fakes instead of the real thing. There should also be a tiny 6-pointed asterisk on the rubber sole, not too far from the Converse logo. After all, the bottom line with those responsible for making knock-offs is the profit margin, not the image of the brand. Imperfect logos can be signs of poor quality control, the kind of thing that would be spotted quickly in a real Converse factory and removed from sale, but which would be sold as “normal” stock from a factory making fakes. The logo on the insole should be clear and not faded or blurred. The toe cap on an authentic pair of Converse should not be curved towards the tongue of the shoe at all. The toe cap will be in sturdy rubber and will be completely straight where it meets the lacing. If you have a pair with a line that stops and starts again then this is a problem. These vary by style and color of the shoe, but should always be completely smooth and straight. Via/ YouTubeĪnother set of details to look at are the pinstripes along the side and the toe cap. If the country of manufacture appears in the middle of the label or towards the bottom of the label then they could be fakes. The place where the shoes were made should be printed on the tongue label as well. This number should also be on the box they came in as well.
If you have two different numbers then something is off.
#Light converse comparison serial number#
Via/ FlickrĪuthentic Converse shoes will have a serial number on the label on the inside of the tongue and each shoe will bear this number. In this case the devil truly is in the details. But, what happens when something is a bit off with your new kicks? When it comes to Converse Chuck Taylor All Star shoes there quite a few small details that can help you to decipher if what you’ve paid money for is the real deal or just a knock off. There’s nothing like new shoes to put a bounce in your step.