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The Large Binocular Telescope at the Mount Graham International Observatory in Arizona uses two curved mirrors to gather light. An optical telescope is a telescope that gathers and focuses light mainly from the visible part of the electromagnetic spectrum, to create a magnified image for direct visual inspection, to make a photograph, or to collect data through electronic image sensors.
A replica of a Chappe telegraph tower (18th century). A 'semaphore telegraph', also called a 'semaphore line', 'optical telegraph', 'shutter telegraph chain', 'Chappe telegraph', or 'Napoleonic semaphore', is a system used for conveying information by means of visual signals, using towers with pivoting arms or shutters, also known as blades or paddles.
Spectral optical depth or spectral optical thickness is the natural logarithm of the ratio of incident to transmitted spectral radiant power through a material. [1] Optical depth is dimensionless , and in particular is not a length, though it is a monotonically increasing function of optical path length , and approaches zero as the path length ...
Free were an English rock band formed in London in 1968 by Paul Rodgers (vocals), Paul Kossoff (guitar), Andy Fraser (bass, piano) and Simon Kirke (drums, percussion).
Free public transport, often called fare-free public transit or zero-fare public transport, is public transport which is fully funded by means other than collecting fares from passengers. It may be funded by national, regional or local government through taxation , and/or by commercial sponsorship by businesses.
Free electricity: The PM Surya Ghar Muft Bijli Yojana's free power for low-income homes was another pledge in the manifesto. 3 Crore house: In the PM Housing Scheme, the BJP manifesto pledges to build 30,000,000 houses, people with disabilities will now be given priority, and care will be taken to make sure they are housed in accordance with ...
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