Okay then,
Let me alter my first hand answers, too some indept research.
Arabian language
First the arabian language is not an invention... if the west adapted some attributes of the language, doesn't mean it accomplished something. The languages we have today are a merger of all previous languages as well are the one's we're speaking a merger of today's languages for the languages of tomorrow.
Lenses:
"The earliest records of lenses date to Ancient Greece, with Aristophanes' play The Clouds (424 BC) mentioning a burning-glass (a convex lens used to focus the sun's rays to produce fire). The writings of Pliny the Elder (23-79) also show that burning-glasses were known to the Roman Empire, and mentions what is possibly the first use of a corrective lens: Nero was known to watch the gladiatorial games through a concave-shaped emerald (presumably to correct for myopia). Seneca the Younger (3 BC--65) described the magnifying effect of a glass globe filled with water. The Arabian mathematician Alhazen (Abu Ali al-Hasan Ibn Al-Haitham), (965-1038) wrote the first major optical treatise which described how the lens in the human eye formed an image on the retina. Widespread use of lenses did not occur until the invention of spectacles, probably in Italy in the 1280s." -- http://en.wikipedia.org/wiki/Lens_%28optics%29
Telescope:
"Hans Lippershey (1570(?)-1619) was a Dutch lensmaker, credited with creating and disseminating designs for the first practical telescope." -- http://en.wikipedia.org/wiki/Hans_Lippershey
"Galileo Galilei invented two important instruments. The first was the calculating compass, which helped solve math problems. The second was a greatly improved telescope, which was first invented by Hans Lipershy of the Netherlands in 1608....
....Galileo also experimented with changing the curve and size of the lenses so you could see further. These first experiments and calculations resulted in his first spyglass. The two hollow metal tubes, one inside the other, had one convex lens on the end (a convex lens has sides that are bowed outward) and the other tube had a concave lens on the end (a concave lens is a lens that has its sides curved in.) This first spyglass was a success and he named it a "telescope" for the Greek words "tele" meaning "far" and "scopein" meaning "see." His telescope was better than Lipershy’s because Galileo’s telescope magnified things almost 15 times more and was much larger than Lippershey’s." http://library.thinkquest.org/J0112389/ ... ?tqskip1=1
Clocks:
"The history of the time telling device can be traced to Antiquity. Vitruvius reports that the ancient Egyptians used clepsydras, a time mechanism run by flowing water. By the 9th century AD a mechanical timekeeper had been developed that lacked only an escapement mechanism. There is a record that in 1176 Sens Cathedral installed a “horologe” – the word still used in French for large clocks. It is derived from the Greek hora meaning hour and legein meaning to tell. This word has led scholars to believe that these earliest timekeepers did not employ hands or dials, but “told” the time with audible signals
The earliest reasonably accurate clocks are the 13th century tower clocks probably developed for (and perhaps by) monks in Northern Italy. These were used to announce the canonical hours or intervals between set times of prayer. Canonical hours differ in length, and varied as the times of sunrise and sunset shifted." -- http://en.wikipedia.org/wiki/Clock
The Mariners Compass
"Compasses were initially used in mysticism in ancient China. The first known use of Earth's magnetic field in this way occurred in ancient China as a spectacle. Arrows were cast similarly to dice. These magnetised arrows aligned themselves pointing north, impressing the audience. Curiously, it took some time for this trick to get used by the Chinese for naval navigation, but by the 11th or early 12th century it had become common.
Knowledge of the compass moved overland to Europe sometime later in the 12th century. Arab mariners apparently learned of it from the Europeans, adopting its use in the first half of the 13th century. About 1358, there is a story about an English monk under the name Nicholas of Lynne, who served as a navigator due to his competence and knowledge in the "magnetic compass". http://en.wikipedia.org/wiki/Compass
Gunpowder
"The earliest solid rocket fuel was a form of gunpowder, and the earliest recorded mention of gunpowder comes from China late in the third century before Christ. Bamboo tubes filled with saltpeter, sulphur and charcoal were tossed into ceremonial fires during religious festivals in hopes the noise of the explosion would frighten evil spirits." -- http://science.ksc.nasa.gov/history/rocket-history.txt
"Gunpowder appears to have been invented in China before the year 1,000 AD, carried through the Middle East into Spain, and thence found its way into Europe. However, a similar concoction of sulphur, charcoal, and saltpeter (or another oxygen generator) may have been known to the Greeks and Romans." -- http://www.hackman-adams.com/guns/aboutgunpder.htm
"There is not doubt that the Chinese invented gunpowder. The ways in which they used it and how their use of gunpowder differed from the West has been debated. The first known recipe for saltpetre, teh principal ingredient of gunpowder, can be found in a Chinese military manual written by Wu Ching Tsung Yao from 1044 (Burke, 1978). This military manual also gave directions for making a bomb using gunpowder so most historians believe that bombs or grenades were used by Chinese troops from before the 11th century. And, although the Chinese did use gunpowder in fireworks for religious purposes, they also used gunpowder in cannons, rockets, and guns. Rocket arrows were used in 1126 to defend the city of Kaifeng which was the capital of the Sung empire." -- http://www-engr.sjsu.edu/pabacker/history/china.htm
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with this rebutal, are you trying to proof the splendor of Islam by claiming inventions? wich are this too nothing (even if they all were from muslims, wich they certainly are not), compared too all the western inventions ever made. Then ask yourself again, wich has the most splendor of the intellect ?