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A periscope is an instrument for observation over, around or through an object, obstacle or condition that prevents direct line-of-sight observation from an observer's current position. [ 1 ] [ 2 ] In its simplest form, it consists of an outer case with mirrors at each end set parallel to each other at a 45° angle.
Schematic of a conventional and a periscope zoom lens A smartphone with a 5x optical zoom periscope lens camera, recognizable by the rectangular shape of its lens. A periscope lens, sometimes called a folded lens, is a mechanical assembly of lens elements that uses a prism or mirror to redirect the light through the lenses with a 90° angle to the optical axis, as in a periscope.
The P-20 development was started in 1946 when State Federal Order of the Red Banner Research Institute Number 20 (now called All-Union Scientific Research Institute of Radio Engineering or VNIIRT [5]) was given the task of developing stationary and mobile early warning ground control and interception radar for the Soviet Air Force. [6]
"There's levels to tattling. Sometimes it's something as little as 'So and so is copying me,' or 'So and so keeps looking at me,' And those don't need to cause an interruption.
The Blue king is the first to arrive. The Red king peers at him through a periscope below the surface, and the Blue king smiles into it, offering to trade with the Reds. The periscope squirts him with red paint. Outraged at this treachery, the Blues retaliate, and begin to paint everything in sight blue. They then meet the Golden army, and ...
If you have a muffin tin, cupcake liners and a few basic pantry staples, then you and your kids are steps away from a fun-filled afternoon making homemade peanut butter cups. In a large mixing ...
Amazon's annual list of the 100 best Valentine's Day gifts includes options for men, women, and kids. ... Amazon has a few ideas to help you out.
Also, "periscope feather" (the wave created by the snorkel or periscope moving through the water) can be spotted in calm seas. During the early months of the Battle of the Atlantic in World War II, British ships using the radar set Model 271 were able to detect the periscope of a submerged submarine at a distance of 800 m (0.50 mi) during tests ...