The focal length of a lens determines the magnification at which it images distant objects. It is equal to the distance between the image plane and a pinhole that images distant objects the same size as the lens in question.hen a lens is used to form an image of some object, the distance from the object to the lens u, the distance from the lens to the image v, and the focal length f are related by. The focal length of a thin lens can be easily measured by using it to form an image of a distant light source on a screen.
The Killing Fields (Khmer: áá¶ááá·áá¶á viel pi-kÊ°iet) are a number of sites in Cambodia where collectively more than a million people were killed and buried by the communist Khmer Rouge regime, during its rule of the country from 1975 to 1979, immediately after the end of the Cambodian Civil War (1970â1975).
Three years later the Seven Fields Development Company (SFDC) was created to help continue the development of the community. The Borough of Seven Fields is a small community located in Southwest Butler County Pennsylvania. Seven Fields is one square mile and according to the 2010 US Census has a population of 2,887. The community is mostly residential, but we boast many businesses and great restaurants in the area. We are bordered on the north, west, and southeast by Cranberry Township and on the east by Adams Township. Located just 17 miles north of Pittsburgh there are many attractions to find. Seven Fields is a beautiful place with a strong sense of community.