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A Fresnel lens (/ ˈ f r eɪ n ɛ l,-n əl / FRAY-nel, -nəl; / ˈ f r ɛ n ɛ l,-əl / FREN-el, -əl; or / f r eɪ ˈ n ɛ l / fray-NEL [1]) is a type of composite compact lens which reduces the amount of material required compared to a conventional lens by dividing the lens into a set of concentric annular sections.
The Himalayan flameback (Dinopium shorii), also known as the Himalayan goldenback, is a species of bird in the family Picidae. At the moment very little is known of this species and more fieldwork is required. The Himalayan flameback is not threatened but it is suspected that deforestation could severely affect the species population. [2]
Sri Lanka is known to be home to 794 species of Hemipterans. Detailed work of Sri Lankan hemipterans are recorded in the book Catalogue of Hemiptera of Sri Lanka. Sri Lanka comprises 74 species in 46 genera and 6 families of aphids within the order Hemiptera. 2 endemic aphid species are found on Sri Lanka
The Himalayan's engine was designed and produced by Royal Enfield 'from the ground up' and shares little to no parts with other contemporaries in the company's line-up. [10] The engine, named the LS410 indicating its long-stroke ratio, is a unit-construction 411 cc single-cylinder, oil-cooled 4-stroke SOHC engine.
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The blue sapphire was declared the national gemstone of Sri Lanka in October 2003. A postage stamp worth LKR 4.50 was issued on 2 October 2003 to mark the announcement. Sri Lanka is famous for blue sapphires, especially known for their size. [21] National sport: Volleyball: Volleyball was officially recognised as the national sport of Sri Lanka ...
The first king of Sri Lanka, Vijaya, was the son of Sinhabahu, the ruler of Sinhapura. Some versions suggest Vijaya was the grandson of Sinhabahu. [28] [29] According to the Mahavamsa and other historical sources, King Vijaya arrived on the island of Tambapanni (Sri Lanka) and gave rise to the Sinhalese.
Dondra Head lighthouse is operated and maintained by the Sri Lanka Ports Authority. The lighthouse is near the village of Dondra, and is approximately 6 km (3.7 mi) southeast of Matara . The name Dondra is a synonym for "Devi-Nuwara" in the local Sinhala language, "Devi" meaning "Gods" and "Nuwara" meaning "City".