I need help!! PLZ!!?

1 . What must happen in order to see an object?





A. Light must be reflected.


B. The object must be translucent.


C. The object must be opaque.


D. Light must be absorbed.





2 . What is a material through which all light passes called?





A. opaque


B. primary


C. transparent


D. translucent





3 . What color light is a mixture of all visible wavelengths of the spectrum?





A. black


B. red


C. cyan


D. white





4 . What color are objects that absorb all colors that reflect little light?





A. white


B. magenta


C. black


D. red





5 . Which of the following is not a primary color of light?





A. magenta


B. red


C. blue


D. green





6 . Which of the following is not a primary color of pigments?





A. magenta


B. red


C. cyan


D. yellow





7 . What is a material that allows you to see some light through it but not all?





A. reflected


B. translucent


C. transparent


D. opaque





8 . Which part of the eyeball contains cone cells?





A. lens


B. retina


C. cornea


D. optic nerve





9 . Which source of light uses heat?





A. incandescent


B. fluorescent


C. potassium


D. luminescent





10 . Which type of lighting is the most inefficient?





A. incandescent


B. fluorescent


C. potassium


D. luminescent





11 . Which color is produced by blending the primary pigments?





A. black


B. white


C. magenta


D. cyan





12 . What happens to light waves when they change speed passing from one medium into another?





A. They are reflected.


B. They are refracted.


C. They are diffracted.


D. They are interfered.





13 . Which type of filter allows waves through that vibrate in only one direction?





A. separation


B. hologram


C. horizontal


D. polarizing





14 . Which type of light contains more than one wavelength and those waves are not aligned?





A. incoherent


B. coherent


C. tungsten-halogen


D. sodium vapor





15 . Which process allows optical fibers to carry information in the form of light?





A. holography


B. polarization


C. electronic flow


D. total internal reflection





16 . Which object reflects light and curves inward?





A. concave lens


B. convex mirror


C. convex lens


D. concave mirror





17 . What is an image called that appears to be inside a flat mirror?





A. virtual


B. real


C. optical


D. focal





18 . What is the point called outside a concave mirror though which light rays are reflected?





A. optical axis


B. virtual point


C. focal point


D. optical point





19 . Which lens is wider in its center and thinner on the edges?





A. focal


B. virtual


C. concave


D. convex





20 . Which of the following is true regarding people with astigmatism?





A. They cannot see objects up close.


B. They cannot see objects near.


C. They have blurry vision at all distances.


D. They are blind.

I need help!! PLZ!!?
I don't know why your not doing your homework yourself. What grade is this stuff? You should think more about these questions they pretty much give you the answer. I'll help you with most of the ones I remember.





I need help!! PLZ!!?


1 . What must happen in order to see an object?





A. Light must be reflected.


B. The object must be translucent.


C. The object must be opaque.


D. Light must be absorbed.





Light enables us to see. Most objects, however, are non-luminous. They do not produce their own light, but they do reflect some of the light that strikes them. When light strikes most objects, it is not reflected in just a certain direction, but is scattered in all directions. This allows the object to be seen from different viewing positions. A person located anywhere in the pathway of the scattered light will receive light from the object and thus be able to see the object.


If there is no light to illuminate our surroundings, we cannot see any of the objects around us. In simplest terms: No light, no sight.











2 . What is a material through which all light passes called?





A. opaque


B. primary


C. transparent


D. translucent





Think of the transparences that teachers use on overhead projectors. They are clear and let light pass through








3 . What color light is a mixture of all visible wavelengths of the spectrum?





A. black


B. red


C. cyan


D. white





The white light is a mixture of the colors of the visible spectra.








4 . What color are objects that absorb all colors that reflect little light?





A. white


B. magenta


C. black


D. red





So if white is all the colors of the spectrum, black is the opposite and sucks up all the color. Think Black Hole. Nothing escapes it.





5 . Which of the following is not a primary color of light?





A. magenta


B. red


C. blue


D. green





Primary colors may either be additive or subtractive. The additive primary colors are red, green, and blue. The subtractive primary colors are cyan, yellow, and magenta.








6 . Which of the following is not a primary color of pigments?





A. magenta


B. red


C. cyan


D. yellow





A color printer uses tiny dots of magenta, cyan, and yellow to produce a multitude of colors and black.





7 . What is a material that allows you to see some light through it but not all?





A. reflected


B. translucent


C. transparent


D. opaque





Opaque-


Definition: 1. not transparent or translucent: impervious to light, so that images cannot be seen through it


2. not shiny: dull and without luster


3. hard to understand: obscure and unintelligible in meaning


4. physics impenetrable by radiation: impenetrable by a specific form of radiation





Translucent-Definition:


1. letting light through diffusely: allowing light to pass through, but only diffusely, so that objects on the other side cannot be clearly distinguished


a translucent membrane


2. glowing: having a glowing appearance, as if light were coming through translucent skin








8 . Which part of the eyeball contains cone cells?





A. lens


B. retina


C. cornea


D. optic nerve


http://www.mdsupport.org/anatomy.html





9 . Which source of light uses heat?





A. incandescent


B. fluorescent


C. potassium


D. luminescent











10 . Which type of lighting is the most inefficient?





A. incandescent


B. fluorescent


C. potassium


D. luminescent











11 . Which color is produced by blending the primary pigments?





A. black


B. white


C. magenta


D. cyan











12 . What happens to light waves when they change speed passing from one medium into another?





A. They are reflected.


B. They are refracted.


C. They are diffracted.


D. They are interfered.





13 . Which type of filter allows waves through that vibrate in only one direction?





A. separation


B. hologram


C. horizontal


D. polarizing





14 . Which type of light contains more than one wavelength and those waves are not aligned?





A. incoherent


B. coherent


C. tungsten-halogen


D. sodium vapor





15 . Which process allows optical fibers to carry information in the form of light?





A. holography


B. polarization


C. electronic flow


D. total internal reflection





16 . Which object reflects light and curves inward?





A. concave lens


B. convex mirror


C. convex lens


D. concave mirror


http://www.fi.edu/fellows/fellow7/mar99/...








17 . What is an image called that appears to be inside a flat mirror?





A. virtual


B. real


C. optical


D. focal








18 . What is the point called outside a concave mirror though which light rays are reflected?





A. optical axis


B. virtual point


C. focal point


D. optical point





If you are looking at something and are focused on one point the then the lights reflecting to one point is?





19 . Which lens is wider in its center and thinner on the edges?





A. focal


B. virtual


C. concave


D. convex





Well a concave goes inward, convex goes out ward. Which means the concave has more glass on the outer creating the cone for the center when the mirror is made and the convex is the one that has the lump in the middle.





20 . Which of the following is true regarding people with astigmatism?





A. They cannot see objects up close.


B. They cannot see objects near.


C. They have blurry vision at all distances.


D. They are blind.











You need to just copy and paste the questions into yahoo and get the answers that way. You need to pay attention more in school.
Reply:1 . What must happen in order to see an object?





A. Light must be reflected.


.





2 . What is a material through which all light passes called?








C. transparent








3 . What color light is a mixture of all visible wavelengths of the spectrum?








D. white





4 . What color are objects that absorb all colors that reflect little light?








C. black








5 . Which of the following is not a primary color of light?





A. magenta





6 . Which of the following is not a primary color of pigments?





A. magenta








7 . What is a material that allows you to see some light through it but not all?








B. translucent








8 . Which part of the eyeball contains cone cells?








B. retina








9 . Which source of light uses heat?





A. incandescent








10 . Which type of lighting is the most inefficient?








D. luminescent





11 . Which color is produced by blending the primary pigments?





B. white








12 . What happens to light waves when they change speed passing from one medium into another?








B. They are refracted.








13 . Which type of filter allows waves through that vibrate in only one direction?








D. polarizing





14 . Which type of light contains more than one wavelength and those waves are not aligned?





A. incoherent








15 . Which process allows optical fibers to carry information in the form of light?





D. total internal reflection





16 . Which object reflects light and curves inward?








D. concave mirror





17 . What is an image called that appears to be inside a flat mirror?





A. virtual








18 . What is the point called outside a concave mirror though which light rays are reflected?








C. focal point








19 . Which lens is wider in its center and thinner on the edges?








D. convex





20 . Which of the following is true regarding people with astigmatism?





A. They cannot see objects up close.


B. They cannot see objects near.





A?B

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