Doublet
(Science: microscopy) two simple lens elements cemented together, for the purpose of giving spherical and chromatic corrections. An achromatic doublet may be composed of a positive crown-glass lens and a negative flint-glass lens. The errors of one element are made to compensate those of the other element.
Doublet (Science: microscopy) two simple lens elements cemented together, for the purpose of giving spherical and chromatic corrections. An achromatic doublet may be composed of a positive crown-glass lens and a negative flint-glass lens. The errors of one element are made to compensate those of the other element...
Dinosaurs represented a major turn in the evolutionary development of organisms on Earth. The first dinosaurs were presu..
The gastrointestinal system breaks down particles of ingested food into molecular forms by enzymes through digestion and..
Lentic or still water communities can vary greatly in appearance -- from a small temporary puddle to a large lake. The s..
Multicellular organisms evolved. The first ones were likely in the form of sponges. Multicellularity led to the evolutio..
Apart from vitamins, the human body also requires high energy sources such as carbohydrates and fats. If you want an ove..
Plants, like animals, produce hormones to regulate plant activities, including growth. They need these hormones to respo..
