Description: Inside a Bitcoin mine that earns $70K a day The virtual goldrush to mine Bitcoin and other cryptocurrencies leads us to Central Washington state where a Bitcoin
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Optics is the branch of physics which involves the behaviour and properties of light , including its interactions with matter and the construction of instruments that use or detect it. Optics usually describes the behaviour of visible , ultraviolet , and infrared light. Because light is an electromagnetic wave , other forms of electromagnetic radiation such as X-rays , microwaves , and radio waves exhibit similar properties.
Most optical phenomena can be accounted for using the classical electromagnetic description of light. Complete electromagnetic descriptions of light are, however, often difficult to apply in practice. Practical optics is usually done using simplified models. The most common of these, geometric optics , treats light as a collection of rays that travel in straight lines and bend when they pass through or reflect from surfaces. Physical optics is a more comprehensive model of light, which includes wave effects
Claudius Ptolemy ( / ˈ t ɒ l ə m i / ; Greek : Κλαύδιος Πτολεμαῖος , Klaúdios Ptolemaîos , [kláwdios ptolɛmɛ́ːos] ; Latin : Claudius Ptolemaeus ; c. AD 100 – c. 170 ) was a Greco-Egyptian writer, known as a mathematician , astronomer , geographer , astrologer , and poet of a single epigram in the Greek Anthology . He lived in the city of Alexandria in the Roman province of Egypt , wrote in Koine Greek , and held Roman citizenship . Beyond that, few reliable details of his life are known. His birthplace ha