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Glass's Guide is the leading British motor trades guide to used car prices, often referred to in the trade as "the bible". Monitoring car values since 1933, it reflects how cars have become increasingly affordable – the £145 list price for a Ford 10 De Luxe (including £5 for an optional sliding roof) was the equivalent of almost two years' salary.
A caravan is an RV, and going RVing would be caravanning. Most caravan designs would probably be called a travel trailer, or in some cases a fifth wheel or camper trailer. Caravans can go to RV parks or some camp sites— not trailer parks, which usually communities of semi-permanent structures called mobile homes. However, sometimes they can ...
Binoculars or field glasses are two refracting telescopes mounted side-by-side and aligned to point in the same direction, allowing the viewer to use both eyes (binocular vision) when viewing distant objects. Most binoculars are sized to be held using both hands, although sizes vary widely from opera glasses to large pedestal-mounted military ...
Current bifocals and progressive lenses are static, in that the user has to change their eye position to look through the portion of the lens with the focal power corresponding to the distance of the object. This usually means looking through the top of the lens for distant objects and down through the bottom of the lens for near objects.
A guide to watching today's total solar eclipse safely — from why glasses are essential to making sure you've got the proper pair Natalie Rahhal April 8, 2024 at 8:37 AM
Full frame glasses have the frame go all around the lenses. Half frames go around only half the lens; typically the frames attach to the top of the lenses and on the side near the top. Frameless glasses have no frame around the lenses and the ear stems are attached directly to the lenses.
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They are incident on the glass-air interface at an angle above the critical angle. These extra rays correspond to a higher density of states in more-advanced formulations based on the Green's function. Using total internal reflection, we can trap and guide the light in a dielectric waveguide (Figure c). The red rays bounce off both the top and ...