Malus niedzwetzkyana Malus niedzwetzkyana Malus niedzwetzkyana, or Niedzwetzky's apple, is a kind of apple native to certain parts of China, Afghanistan, Kazakhstan, Kyrgyzstan, and Uzbekistan noted for its red-fleshed, red-skinned fruit and red flowers. Some botanists consider it a distinct species, while others have argued it is simply an unusual variety of the common apple, "Malus pumila". Niedzwetzky's apple is rare, often growing as an isolated tree, and is endangered throughout its range by agricultural encroachment and logging operations. Only 111 specimens of the tree are known to survive in Kyrgyzstan. The conservation group Fauna & Flora International is working to save
Étienne-Louis Malus index between the surface and the interior of the glass). It was not until 1815 that Sir David Brewster was able to experiment with higher quality glasses and correctly formulate what is known as Brewster's law. This law was later explained theoretically by Augustin Fresnel, as a special case of his Fresnel equations. Malus is probably best remembered for Malus's law, giving the resultant intensity, when a polariser is placed in the path of an incident beam. His name is one of the 72 names inscribed on the Eiffel tower. Étienne-Louis Malus Étienne-Louis Malus (; ; 23 July 1775 –