The human eye is a wonderful instrument, relying on refraction and lenses to form images. There are many similarities between the human eye and a camera, including:
a diaphragm to control the amount of light that gets through to the lens. This is the shutter in a camera, and the pupil, at the center of the iris, in the human eye.
a lens to focus the light and create an image. The image is real and inverted.
a method of sensing the image. In a camera, film is used to record the image; in the eye, the image is focused on the retina, and a system of rods and cones is the front end of an image-processing system that converts the image to electrical impulses and sends the information along the optic nerve to the brain.
The way the eye focuses light is interesting, because most of the refraction that takes place is not done by the lens itself, but by the aqueous humor, a liquid on top of the lens. Light is refracted when it comes into the eye by this liquid, refracted a little more by the lens, and then a bit more by the vitreous humor, the jelly-like substance that fills the space between the lens and the retina.
The lens is critical in forming a sharp image, however; this is one of the most amazing features of the human eye, that it can adjust so quickly when focusing objects at different distances.
President Obama’s purpose in this section of the speech is to
- To inspire the American people to collectively work toward a better future.
<h3>What is the purpose of the text?</h3>
In this text, the purpose of the speaker is to inspire hope in the American people.
The President wanted them to see that they have what it takes to make their country better. So, option C is right.
Learn more about Obama's Second Inaugural Address here:
brainly.com/question/1573715
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Answer:
Freedom is being able to think, say, and do what you want — to live your life as you please. Safety is being protected from harm — to live your life without fear of danger.
Though people may uphold freedom as an ultimate virtue, it’s limited in society. You can’t have absolute freedom because it takes away from the safety and the freedom of others. If anyone could do whatever they wanted, and they chose to hurt and kill, that restricts someone else’s freedom to live as they please.
But you also can’t have absolute safety. That would require monitoring and limiting the actions of everyone, submitting to a protective but also authoritative body. Restricting actions limits freedom, but it also limits safety because you become vulnerable to whoever you trust for protection.
Absolute freedom and absolute safety don’t exist in the real world. They rely on each other. Freedom needs safety to be free, and safety needs freedom to be safe.
Within the structure of a society, an ideal government holds the authority and responsibility of balancing the two — giving as much freedom and as much safety as possible to as many people as possible.
