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Red (635 nm), blueish violet (445 nm), and green (520 nm) laser pointers. A laser pointer or laser pen is a (typically battery-powered) handheld device that uses a laser diode to emit a narrow low-power visible laser beam (i.e. coherent light) to highlight something of interest with a small bright colored spot.
A speaker giving a presentation with an RF pointer in his left hand. Using a wireless clicker, helps the presenter to move freely, instead of being obliged to stay next to the computer, can get closer and keep in touch with the audience, watching the presentation together with them, being able to use the built-in laser pointer, in order to emphasize specific points in the dialogue with the ...
LE Systems, under the sponsorship of DARPA, developed a dazzler based on a DPSS laser, with green light output at 532 nm, essentially a higher-intensity version of a green laser pointer. 532 nm light interacts with human eyes well in both daylight and reduced light conditions.
For best results, Redlook recommends using this device one to three times a day for five minutes each. Wavelengths: Blue Light: 460 nm. Red Light: 630 and 660 nm. Near-Infrared: 850 and 900 nm.
Light level 5.0 μW/cm 2; for example, a legal 5 mW laser pointer at 1,200 feet (370 m). Simulation of temporary flash blindness where the image takes from a few seconds to a few minutes to fade away, depending on how much light entered the eye. Light level 50 μW/cm 2; for example, a legal 5 mW laser pointer at 350 feet (110 m).
Distance education, also known as distance learning, is the education of students who may not always be physically present at school, [1] [2] or where the learner and the teacher are separated in both time and distance. [3] Traditionally, this usually involved correspondence courses wherein the student corresponded with the school via mail.
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