BTEC physics brief 5

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Syed Afjal Ali 11T Science (BTEC) 28/04/12
Reflecting telescope:
The reflective telescope works by using curved mirrors to collect and focus light. There is a large
concave mirror which collects and reflects light to create an image. Once the image is formed the lens
in the eye piece magnifies the image, making it easier to notice vague or dark objects. Larger
reflecting telescopes are capable of seeing objects that are a millionth or a billionth the brightness of
the faintest star that can be seen by the human eye.
Refracting telescope:
The refracting telescope works similarly to a magnifying glass. It uses a convex glass lens to bend
light and bring it into focus. It bends more light due to the fact that this lens is thicker in the centre
than it is towards its edges. This allows more light to come together at a focused point where the
actual image is created. Therefore, when someone looks into the eyepiece, the concave lens
magnifies the image.

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Syed Afjal Ali 11T Science (BTEC) 28/04/12
Hubble telescope:
The Hubble space telescope is a reflecting telescope which uses infrared light, UV light and visible
light to create an image. Construction of the telescope was completed in 1985; it has a maximum
diameter of 14ft (4.2m). However the launch of the Hubble space telescope was delayed due to the
1986 Space Shuttle Challenger disaster. Hubble was launched on the space shuttle on April 25, 1990.…read more

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Syed Afjal Ali 11T Science (BTEC) 28/04/12
Chandra X-ray observatory:
The Chandra X-ray observatory was launched on July 23, 1999. The diameter of the Chandra X-ray
observatory is 32.8 inches (83.3 cm). It is a reflecting telescope; it is able to detect X-ray sources. At
45 feet in length, the Chandra X-ray observatory is the largest satellite the shuttle has ever launched.…read more

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Syed Afjal Ali 11T Science (BTEC) 28/04/12
Liverpool telescope:
The Liverpool telescope is located in La Palma, Canary Isles. It is 2,344 metres above sea level. It
weighs 24.0 metric tonnes. The mirror diameter is 2.0 metres. The Liverpool telescope is a 2 metre
fully robotic Ritchey­Chrétien telescope that observes autonomously without any human interaction.
Other methods that are used to investigate the universe:
Voyager 2:
The Voyager 2 launched on August 20, 1977, from Cape Canaveral. It weighs 722 kilograms.…read more

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Syed Afjal Ali 11T Science (BTEC) 28/04/12
The Mars Rover has a diameter of 2.65 metres. It is powered by solar panels and lithium-ion battery
system which provides 140 watts on Mars surface. The scientific instruments the Mars Rover
consisted of were panoramic cameras, miniature thermal emission spectrometer, Mössbauer
spectrometer, alpha particle X-ray spectrometer, microscopic imager, and rock abrasion tool and
magnet arrays. The program cost was approximately $820 million in total.…read more

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Syed Afjal Ali 11T Science (BTEC) 28/04/12
The Apollo 11 crew included the commander
Neil A. Armstrong, commander module pilot
Michael Collins and lunar module pilot Edwin
"Buzz" E. Aldrin Jr. It launched on July 20, 1969.
The aim of the Apollo 11 mission was to land
the first man on the moon before the Russians.
This was because of the ongoing Cold War
between the Russian and Americans.…read more


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