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Halogen – Incandescent bulb in which the filament is tungsten, but the gas filling
the glass envelope is halogen (iodine or bromine generally). The presence
of the halogen increases the length of the bulb’s life. Halogen lamps tend
to be run at higher temperatures which allows higher luminous efficacy,
apparent brightness, and whiter color temperature (see Color
Temperature). Microscopes with halogen lamps, give more intense, white
light, but also emit considerable heat which can quickly kill living
specimens.
Transmitted (light) – In microscopes, transmitted light refers emitted from the
illuminator (light source) and passes through the slide or specimen to the
objective lens.
Incident (light) – refers to any light that falls on the specimen or slide on the
microscope. In Dissecting (Stereo microscopes or Ken-A-Vision
VisionScopes) the incident light is provided by a top of supra-stage light
source, which illuminates the top surface of the specimen or slide. The
light is generally not transmitted through the specimen or slide.
Tungsten - In most standard incandescent lights, the filament that is activated and
glows to emit light is made from Tungsten. Characteristic of Tungsten
lamps is that they give intense, white light, but also emit considerable heat
which can quickly kill living specimens.
Light Rheostat – a device which allows for adjustment of light intensity on a microscope,
similar to a room dimmer switch. Actual effect is produced by placing a variable
resistor in the circuit causing the current applied to the light to vary.
Light Sensitivity – In Ken-A-Vision cameras, refers to the amount of incident light
needed to activate the camera chip. The smaller the number the less light needed
to produce an image on the camera.
Luminance - Black and white portion of a video signal representing picture contrast and
brightness.
Macro – A combining form which meaning long (in extent, or duration) large, enlarged,
or elongated. It is the opposite of –micro.
Magnification - is to make something larger in size then it really is by use of lenses. In
microscopes, this is usually indicated by the abbreviation “X”. So a 10X eyepiece
will magnify the image on a slide by 10 times. To determine total magnification
of a specimen by a microscope, simply multiple the eyepiece magnification times
the objective magnification. (for example –if the eyepiece is 10X and the
objective is 10X then the total magnification would be 100X ). As magnification
increases, generally more light is needed to maintain the same level of resolution
(defined below)
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