mir

Questions and answers by mir, page 2

Questions (269)

Which types of materials can be used to make color filters?opaque and translucent transparent and translucent transparent and
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Which type of material absorbs light?opaque transparent translucent
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What determines the color of an opaque object?the color of light that passes through it the wavelengths of light that it
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Which type of material transmits most of the light that strikes it without scattering any?transparent opaque translucent
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What determines the color of an opaque object?the wavelengths of light that it absorbs the color of light that strikes it the
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The color of a pigment is the color of the light _____.that it absorbs that shines through it that strikes it that it reflects
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Complementary colors of light combine to make _____.white magenta yellow cyan
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When mixed in equal amounts, the three primary colors of pigments produce _____.black green white red
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When two primary colors of light are combined in equal amounts, _____ is produced.white light black light a complementary color
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Yellow, magenta, and cyan are _____.the colors of ink used in printing combined to make white light secondary colors of pigments
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A virtual image is _____.an upside-down image that forms where light rays meet an image projected by a mirror onto another
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A reflection is diffuse if _____.it reverses left and right it produces a virtual image it produces rays at different angles it
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When light rays from your body are reflected in a plane mirror, _____.they are actually coming from behind the mirror your brain
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The representation of light as a straight line is called a _____.beam particle wave ray
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The image produced by a plane mirror _____.reverses up and down is larger than the object reverses left and right is smaller
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What are the secondary colors of pigments?red, green, blue white, black, gray magenta, yellow, cyan red, yellow, blue
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Which of these materials are transparent?a car window covered in ice clear glass, water, and air a thin shade that allows some
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A piece of cloth appears red under red light, green under green light, and blue under blue light. What color is the cloth?blue
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What is a flat sheet of glass with a silver-colored coating on one side?plane mirror plane lens concave lens convex mirror
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When the three primary colors of light are mixed, what color is seen?white purple yellow black
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What happens when parallel rays of light hit a smooth surface?regular reflection plane reflection diffuse reflection
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The color seen when a translucent object is looked at is the color it _____.reflects transmits absorbs complements
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Which type of material reflects or absorbs any light that strikes it?opaque concave transparent translucent
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What is formed when a copy of an object is formed by reflected light?an image a mirage a mirror an echo
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How does the image produced by a plane mirror compare to the original object?It is upright and the same size as the original
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When equal amounts of all the colors of light are mixed, what is seen?black light white light secondary colors of light
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What type of color is yellow?the complementary color to red a primary color of pigments a secondary color of pigments a primary
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What are the primary colors of light?red, yellow, blue yellow, cyan, magenta red, orange, yellow, green, blue, violet red,
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A transparent material _____ light.diffuses reflects transmits absorbs
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What type of image does a plane mirror produce?real and upright virtual and upright virtual and inverted real and inverted
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How does a prism produce colors from white light?Glass changes the speed of white light, causing the colors to separate. A prism
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A material with the highest index of refraction _____.reflects light the least reflects light the most bends light the least
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Refract means _____.to bend to bounce to twist to reverse
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You can sometimes see a mirage because _____.light rays can be bent by hot air light rays can be bent by puddles asphalt roads
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Green light has _____.a shorter wavelength than red light a shorter wavelength than violet light a longer wavelength than red
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You can sometimes see a mirage because _____.white light reflects off smooth surfaces light rays can be bent by hot air light
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You can sometimes see a mirage because _____.white light reflects off smooth surfaces light rays can be bent by hot air light
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.Green light has _____. a shorter wavelength than red light a shorter wavelength than violet light a longer wavelength than red
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Refract means _____.to bend to twist to bounce to reverse
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A material with the highest index of refraction _____.reflects light the most bends light the least reflects light the least
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How does a prism produce colors from white light?A prism bends different wavelengths of light by different amounts. A prism
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In relation to the object, where is a virtual image formed with a convex and a concave lens?A. on the object side of a concave
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How would you describe the image that would be produced by the convex lens in the drawing?a real, upside-down image at point B a
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How would you describe the image that would be produced by the concave lens in the drawing?a virtual, upside-down image at point
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A convex lens with an object placed closer to it than its focal point _____.forms a real image on the same side of the lens
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A concave lens _____.can form real and virtual images can only form real images can only form virtual images can form images
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A concave lens _____.is thicker at its center than at the edges bends light rays away from the optical axis produces real and
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Which instrument makes use of a concave mirror?microscope reflecting telescope refracting telescope camera
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Optical instruments all use _____ either to magnify images or to gather and focus light.convex lenses concave lenses concave
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What is the purpose of the plane mirror in a reflecting telescope?to keep the image in focus to magnify the image to gather
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A refracting telescope uses an objective lens _____.to produce an upright image to magnify the image to view very small objects
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The convex lens in an optical instrument’s eyepiece _____.gathers light magnifies the image turns the image right side up
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What is an advantage of using a laser over a scalpel for surgery?Laser surgery is much faster. A laser also seals blood vessels.
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What does “stimulated emission of radiation” mean?Radioactive particles in a laser emit gamma rays of the same wavelength.
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How is light amplified in a laser?Photons “leak” through a partially reflecting mirror, causing them to travel in step.
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A laser is used to make a CD or DVD by _____.creating a holographic surface on a plastic disc burning grooves into a blank
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How is laser light different from the light produced by a flashlight?Flashlights use reflecting mirrors and lasers do not. The
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A laser is used to make a CD or DVD by _____.cutting patterns of pits into a blank plastic disc creating a holographic surface
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What is an advantage of using a laser over a scalpel for surgery?A laser also seals blood vessels. A laser can cut through
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How is light amplified in a laser?Photons collide with gas particles, multiply, and reflect back and forth in a tube. Photons
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What does “stimulated emission of radiation” mean?Gas particles in a laser emit photons of light when exposed to an electric
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Total internal reflection _____.causes light rays to travel in parallel lines through optical fiber allows most laser light to
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In an operating room, which device would you not expect to find connected to an optical fiber cable?scalpel monitor microscope
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Which of the following is not a typical benefit from the use of optical fibers for surgery?Surgeons can make smaller cuts, or
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Which statement is not true of optical fiber?Optical fiber can carry thousands of phone conversations. Optical fiber completely
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What is necessary to achieve total internal reflection?a small angle of incidence a mirror a large angle of incidence an optical
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What does a concave lens look like?thicker in the center than at the edges thinner in the center than at the edges flat on one
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Why do prisms project a spectrum when a white light shines through them?different colors of light are refracted at different
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What is a three-dimensional photograph created by using a laser?a sonogram a thermogram a photogram a hologram
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What is the most common use of telescopes?to study objects in space to look at tiny nearby objects to focus the light from the
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In a microscope, where is the specimen placed?close to the objective close to the convex mirror close to the eyepiece close to
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What is the bending of light rays as they enter a new medium?refraction diffuse reflection regular reflection diffraction
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Why do doctors use lasers to repair detached retinas?to change their shape to prevent blindness to prevent internal bleeding to
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What are the two main types of telescopes?refracting and reflecting refracting and radio X-ray and radio radio and reflecting
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What causes a mirage?a refraction of light as it as passes through layers of air at different temperatures a refraction of light
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When were the rings of Saturn and the moons of Jupiter first seen?about 200 years ago, in the mid 1800s about 1,000 years ago,
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How are laser beams that are used as signals usually sent from transmitter to receiver?through optical fibers through the air
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What happens when light passes from air into water?The light forms a mirage. The light speeds up. The light slows down. The
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How can signals be sent through optical fibers?by changing the color of light by changing the frequency by sending pulses of
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What angle of incidence is required for total internal reflection?a small angle a large angle a 90° angle a 180° angle
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Why doesn’t any light escape from the sides of an optical fiber?because the angle of incidence is so small because the angle
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What type of lens is thicker in the center than at the edges?a reflecting lens a virtual lens a concave lens a convex lens
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What type of image does a concave lens produce?no image only a virtual image both real and virtual images only a real image
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Which type of light does a flashlight produce?incoherent cold light white light coherent
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What is the image of a distant object caused by refraction of light?prism hologram mirage rainbow
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How are lasers used to record information on a compact disc?The laser creates magnetic stripes on the disc in a pattern. The
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Which is a curved piece of glass or other transparent material used to refract light?a concave lens an optical fiber a reflector
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What are long, thin strands of glass that carry light for long distances?optical fibers lasers holograms optical wires
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Why are distant galaxies and stars so hard to see?because they are so small, they must be magnified because they are so large,
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Use the diagram to answer the question.Referring to the figure, what type of image would this lens form? a real image an
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Where did the term “laser” come from?the company that created the first laser: “Lazarus Energy Research” the phrase
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When you chew your food to break down the larger pieces into smaller particles, how are you helping to increase the rate of the
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Most of an atom’s volume is found _____.between the protons and neutrons in the protons and neutrons in the electron cloud in
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The moon accelerates because it is _____.in a vacuum in space continuously increasing its speed of orbit constantly increasing
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What is one difference between a galvanometer and an electric motor?An electric motor uses electrical energy to spin. A
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What is the number placed below an element’s symbol in a chemical formula called?a subscript a coefficient a product a
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Which process causes the handle of a spoon in a bowl of soup to become warm?boiling melting combustion conduction
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When did Mendeleev publish his first periodic table?1913 1776 1869 1949
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How does an individual figure the total force exerted on an object by two forces acting in opposite directions?Divide the
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Which of the following statements is a part of John Dalton’s atomic theory?Electrons move in specific orbits around the
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