PARIS Harrison Smith Youth Jersey , April 28 (Xinhua) -- France recorded a slower than expected economic pace of 0.3 percent GDP growth in first three months of the year due to sluggish household spending and falling exports, a report said Friday.

 

Rising by 0.5 percent in the last quarter of 2016, economic activity slowed at the start of this year as consumer spending stalled over the period at 0.1 percent from 0.6 percent a quarter earlier, national statistics institute Insee said in the report.

 

Sales abroad reported a negative trend in the first quarter after falling by 0.7 percent compared to a 1.4-percent rise a quarter earlier Kirk Cousins Youth Jersey , while imports rose by 0.7 percentage points to 1.5 percent.

 

Consequently, "foreign trade balance weighed down on GDP growth: -0.7 points after +0.2 points in the previous quarter," said the report.

 

For 2017, the French government expects economic growth to expand by 1.5 percent from 1.1 percent a year earlier.

 

Take closer look at Guangxi Beibu Gulf Port

 

Yoga lovers practise yoga amid hawthorn blossoms in Hebei

 

Construction members work at Liaoning section of high-speed railway

 

Cross-strait craftwork expo held in SE China's Fujian

 

Models present creations at Vietnam Int'l Fashion Week

 

South Koreans Adam Thielen Youth Jersey , religious figures protest against THAAD in Seoul

 

Aerial views of overpasses in north China's Tianjin

 

Night view of downtown Hangzhou in east China's Zhejiang

There are two primary types of telescopes: refracting telescopes (which use lenses) and reflecting telescopes (which use mirrors).

Refracting telescopes use a spherical or parabolic concave primary mirror to reflect incoming (parallel) rays of light from astronomical objects to a focus. Since this focus sits in the path of the incoming light, reflecting telescopes have to use one of several different strategies to get the image formed at this focus to the observer.

Isaac Newton developed the first reflecting telescope in 1668, which used a flat secondary mirror, located in front of the primary mirror and set at an angle Stefon Diggs Youth Jersey , to reflect light into an eye piece. Telescopes following this simple design, now known as Newtonian telescopes, are popular with amateur astronomers today.

Another design for a reflecting telescope was published in 1672 by Laurent Cassegrain. This telescope used a primary concave mirror and a smaller secondary convex mirror to reflect light onto the secondary, though a hole in the primary mirror and onto an eyepiece. This design allows for a shorter telescope tube relative to the diameter of its mirror. Telescopes following this design Jalyn Holmes Womens Jersey , known as Cassegrain telescopes, are used by amateur and professional astronomers today.

While the first telescopes, including the telescope used by Galileo to discover Jupiter’s moons, were refracting telescopes Brian O'Neill Womens Jersey , most large telescopes used by amateur astronomers and virtually all research telescopes used by professional astronomers are reflecting telescopes. While both kinds of telescopes can collect and focus light from distant objects, mirrors have several advantages over lenses when used in telescopes.

1) Chromatic aberration: As light passes through glass at an angle, different wavelengths (colours) of light will bend at different angles. This is useful when you are trying to separate the colours of light with a prism, but less useful when you are trying to focus a source of white light to a single point. All glass lenses will exhibit chromatic aberration — blurry fringes of different colours at the edges of an object. While careful design can reduce chromatic aberration Daniel Carlson Womens Jersey , it cannot eliminate it.

The angle that light reflects off of a mirror does not depend on its wavelength (colour), so reflecting telescopes focus all colours of light to the same point. Thus, they do not experience chromatic aberration.

2) Very large mirrors are easier to manufacture than very large lenses. In addition, to be used in astronomy Mike Hughes Womens Jersey , lenses have to be perfect throughout. Mirrors only have to be perfect and polished on one side.

3) Since the primary mirror is mounted at the end of a telescope, it can be supported along its base. Lenses used in refracting telescopes can only be supported on their sides. Thus, extremely large lenses (larger than about 1 m) tend to sag under the effects of gravity, distorting the image. This is not a problem for large mirrors.

Why are large mirrors so important? While many people think that the primary purpose of a telescope is to magnify astronomical objects Jaleel Johnson Womens Jersey , this is not the case. While telescopes may magnify objects to some extent, their primary purpose is to act as “light buckets” — to collect as many photons from a distant object as possible. Telescopes also allow observers to resolve small details and make sharp images. Both the light collecting ability and the resolving power of the telescope depends on the size of the mirror — in general, the larger the mirror, the more powerful the telescope. Never have got an office environment chair for mind June 24 Pat Elflein Womens Jersey , 2012 | Author: writinghulk | Posted in Business

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