By Steven J. Zaloga, Terry Hadler, Mike Badrocke
Steven ZalogaвЂ™s very good research of this specialized attack motor vehicle tracks the Amtrac's occupation from early prototypes to trendy types, targeting operational advancements, the strategies governing deployment and use, and the varied editions.
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Extra info for Amtracs US Amphibious Assault Vehicles
The camera image is normal and is not reverted. You should be careful here. You have learned that the normal is an imaginary line at a right angle to an optical surface, but when you are talking about images, normal has another When you look at anything, the lens will form an image of that object on the back of each eye. We will discuss this in more detail a little further on in this manual. You can form your own images. You will need a light source (an electric bulb will do). The image will be easier to see if the bulb is the only source of light in the room.
The image is erect and reverted. Notice that the image appears to be exactly the same distance behind the mirror as the object is in front of the mirror. Look at figure 3-3 once more, and you will see that each point on the image lies on the normal drawn from the mirror to the corresponding point on the object. Each point on the image is the same distance from the mirror’s surface as the corresponding point on the object. A single mirror is sometimes used to reflect light and images, such as an adjustable mirror on a car.
This is because of its high resistance to abrasion and damage caused by atmospheric elements. Occasionally prisms are used for both refraction and reflection in optical instruments. The surfaces of a prism are not easily disturbed, and a prism can produce more numerous reflection paths than a mirror. Prisms are used singly or in pairs for changing the direction of light from a few seconds of arc (measuring wedges) to as much as 360 degrees. To see how light is refracted by a prism, look at figure 3-6.