Lighthouses Images

lighthouses images
i need some help in this conceptual questions..?

1)a beacon in lighthouse is to produce a parallel beam of light. The beacon consists of bulb be placed outside the focal point, at the focal point or inside the focal point of lense? State ur reason.

2)two people who were glasses were camping. One is near sighted and the other is farsighted. Whose glasses may be useful in a starting a fire with sun rays? Give ur reasoning

3)if we read for a long time our eyes become tired. When this happen it helps to stop reading and look at distance object. From the point of view of ciliary’s muscle why does this refresh the eyes?

4)which of the following are produce final image that are virtual.1)a projector 2)a camera 3)a magnifying glass 4)eyeglasses 5)a compound microscope 6)an astronomical telescope.

1. at the focal point of the lens or mirror. Because a parallel beam gets focused at the focal point.
2.The guy with farsight. His lenses are covex and produce a real focal spot where the sun rays conerge. for the near sighted person, the lesnses are cylindrical and will lead to beam divergence.
3. By shifting our focus from near to far off objets, the distance between the lens and the retina changes and this helps in relaxing the muscles. The distance reduces when we see distant objects and thus reduces the muscle tension.

4. Magnifying glass produces the virtual image since the object is between the lens and its focal spot.

Ohio Lighthouses (Images of America) (Images of America (Arcadia Publishing)) Ohio Lighthouses (Images of America) (Images of America (Arcadia Publishing))
List Price: $21.99
Sale Price: $14.43

Ohio Lighthouses reveals a multitude of stories about the structures along Lake Erie. It chronicles make overs, such as the transformation of the 1821 Marblehead Lighthouse from ugly duckling to beautiful swan...

Guarding Door County:  Lighthouses and Life-Saving Stations  (WI)  (Images of America) Guarding Door County: Lighthouses and Life-Saving Stations (WI) (Images of America)
List Price: $21.99
Sale Price: $14.19

Jutting out of Wisconsin into the blue waters of Lake Michigan, the scenic peninsula of Door County is endowed with the longest coastline of any county in the nation. Since the mid-1800s, the region has boasted a strong maritime industry, dependent on the constant vigilance and efforts of U...

South Carolina Lighthouses (Images of America) South Carolina Lighthouses (Images of America)
List Price: $21.99
Sale Price: $15.04

Boasting one of the oldest lighthouses in North America and the most working lighthouses today, South Carolina has a long seafaring history. In 1767, the Morris Island Lighthouse was built at the entrance to Charleston Harbor, and before 1860, there were lighthouses in Georgetown, Cape Romain, Bull's Bay, and Hunting Island...

Lighthouses of the Bay Area (Images of America: California) Lighthouses of the Bay Area (Images of America: California)
List Price: $19.99
Sale Price: $11.60

The 1848 discovery of gold in the hills of California brought prospectors and adventurers west; many came across the country on the treacherous western trails, while others came by sea. The rugged coast of California and the dangers of the San Francisco Bay waters claimed many ships and their passengers...

Lighthouses of the Ventura Coast (Images of America Series) (Images of America (Arcadia Publishing)) Lighthouses of the Ventura Coast (Images of America Series) (Images of America (Arcadia Publishing))
List Price: $21.99
Sale Price: $14.72

The Ventura County coast has been illuminated for more than a century by three distinctive lighthouses, united in their mission of warning mariners of coastal hazards and guiding ships to safe passage...

Maryland's Lighthouses (Images of America: Maryland) Maryland's Lighthouses (Images of America: Maryland)
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Sale Price: $14.75

In Colonial times, as the Chesapeake Bay and larger rivers became vital shipping channels, the need arose to mark Maryland’s dangerous shoals and waterways. Lighthouses sprang up throughout the 1800s and early 1900s, including wood-framed cottages placed upon screw pile foundations that stood offshore in the unforgiving waters...

Florida Lighthouses (Images of America) Florida Lighthouses (Images of America)
List Price: $21.99
Sale Price: $3.25

Sporting the second-longest coastline in the United States, Florida has over 8,000 miles of sparkling beaches and waterfront property. This valuablelandscape and the region's position between the Atlantic Ocean and the Gulf of Mexico made Florida key in the early expansion of American trade routes, but the state's several capes and dangerous reefs, rocks, and shoals made travel quite perilous to unwary mariners...

Cana Island Lighthouse   (WI)  (Images of America) Cana Island Lighthouse (WI) (Images of America)
List Price: $21.99
Sale Price: $14.81

The Cana Island Lighthouse is one of the most picturesque of any lighthouses still operating on the Great Lakes today. The beautiful peninsula of Door County has a long and bountiful tradition of maritime history, including its many lighthouses...

Georgia's Lighthouses (Images of America: Georgia) Georgia's Lighthouses (Images of America: Georgia)
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Sale Price: $13.48

When British general James Oglethorpe landed on Georgia's coast in 1733, he realized that the success of his new colony, Savannah, depended largely on its establishment and development as a commercial port...

Lighthouses of San Diego (Images of America: California) Lighthouses of San Diego (Images of America: California)
List Price: $19.99
Sale Price: $13.51

As his ship rounded the high point off Point Loma, San Diego, in 1859, Richard Henry Dana wrote, "We were greeted by the cheering presence of a light-house." In reality, beams from San Diego's first lighthouse were repeatedly lost in cloud and fog, and all too soon came agitation for a more effective light at a lower elevation...

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