Q&A Hero

Q: When you look into a pool of water, the depth looks less than it actually is because of a. interference b. diffraction c. specular reflection d. refraction e. polarization

Q: In optics, what is meant by an "interface?"a. optically connecting one computer to anotherb. using the image created by one lens as the object for another lensc. when the crest of one wave lines up with the trough of another waved. none of the above

Q: A light ray bends when it goes from one medium to another because of a. interference b. diffraction c. specular reflection d. refraction e. polarization

Q: An object is 50 cm in front of a plane mirror. Its image will be located a. 50 cm in front of the mirror b. at the mirror's surface c. 50 cm behind the mirror d. 25 cm in front of the mirror e. 25 cm behind the mirror

Q: Which of the following is not involved in the formation of a rainbow?a. interference b. dispersion c. internal reflectiond. refraction

Q: If you see a rainbow near the time of sunset, where in the sky will the rainbow be? a. overhead b. toward the eastern horizon c. toward the western horizon d. toward the northern horizon e. toward the southern horizon

Q: You see colors in a rainbow because of a. interference b. diffraction c. specular reflection d. dispersion e. polarization

Q: Optical fibers work because of a. interference b. diffraction c. total internal reflection d. diffuse reflection e. polarization

Q: According to the law of reflection, a light ray striking a mirror at an angle of incidence of 30 degrees will leaves the mirror at an angle ofa. 60 degreesb. 30 degreesc. less than 30 degreesd. none of the above

Q: Certain types of sunglasses are very effective at diminishing light reflected from surfaces because of a. interference b. diffraction c. specular reflection d. diffuse reflection e. polarization

Q: When light passes through two or more narrow slits, an alternating dark and bright pattern is observed on a screen because of a. interference b. diffraction c. specular reflection d. diffuse reflection e. polarization

Q: Thin film interference is responsible for the colors ofa. bird feathers b. gasoline spills c. soap bubblesd. all of the above

Q: Light spreads out when it passes through a narrow slit because of a. interference b. diffraction c. specular reflection d. diffuse reflection e. polarization

Q: A helium neon laser generates light of 632.8 nm wavelength. What color is that?a. blue b. yellow c. redd. green

Q: The colors of objects we see by reflected light are due toa. interference b. selective absorption c. specular reflectiond. diffuse reflection

Q: Why are optical fibers important for communication?a. They can carry thousands of times the information that wires can.b. Light goes faster than electricity.c. They carry digital information. Wires can"t carry digital information.d. all of the above

Q: Liquid crystal displays make use of a. interference b. diffraction c. specular reflection d. diffuse reflection e. polarization

Q: Which angle is the angle of incidence for the light ray shown approaching the plane mirror?a. 60b. 30c. neitherd. either

Q: Which of the lines in the figure represents the normal to the surface at point P?a. 1b. 2c. 3d. 4e. none of the above

Q: What is meant by the "normal" to a surface? a. a line perpendicular to the surface at a given point b. the angle between the surface and the light ray c. a line parallel to the surface at a given point d. the direction of a reflected ray

Q: You do not see your image when you look at a flat rough aluminum surface because of a. interference b. diffraction c. specular reflection d. diffuse reflection e. polarization

Q: You can see your image in a mirror because of a. interference b. diffraction c. specular reflection d. diffuse reflection e. polarization

Q: In order to see a rainbow, the sun must be directly in front of you.

Q: The sky is blue due to air molecules scattering sunlight in all directions.

Q: The speed of light in any transparent medium is the same as the speed of light in a vacuum.

Q: LCDs operate on the principle of refraction through glass.

Q: A magnifying glass with focal length 15 cm is placed 10 cm above a stamp. The image of the stamp is located 30 cm above the magnifying glass.

Q: The magnification of the magnifying glass in the previous problem is "3.

Q: For the projector in the previous problem, the image is 10 times as large as the object.

Q: NARRBEGIN: Lens formula relatingThe lens formula relating the image distance, p, to the focal length, f, and object distance, s, isThe magnification of a lens isNARRENDA movie projector is equipped with a 0.5 m focal length lens that is positioned 0.505 m in front of the film. The distance in front of the lens that a screen must be placed for an image to be in focus is 50.5 m.

Q: Halos are caused by hexagonal ice crystals in the upper atmosphere.

Q: A converging lens always forms an object's image at the focal point of the lens.

Q: An image seen projected on a screen by a single lens is always inverted.

Q: In the atmosphere, the intensity of scattered sunlight of longer wavelength is greater than that of shorter wavelength.

Q: A diverging lens is thicker at the center than the edges.

Q: A person looking through eyeglasses sees real images.

Q: A convex mirror will allow you to see large areas normally hidden from your view.

Q: The Hubble Space Telescope has been repaired.

Q: Diverging lenses have negative focal lengths.

Q: The ideal shape for the primary mirror of a telescope is concave parabolic.

Q: A curved mirror that produces an enlarged image will also have a greater field of view than a plane mirror.

Q: You look at yourself in a plane mirror. If you move away from the mirror and look at yourself again, you now see more of yourself.

Q: A one-way mirror works because its surfaces are half-silvered.

Q: An EM wave with a wavelength of 500 nm will be visible.

Q: Astigmatism is due to too flat a cornea.

Q: The lens in your eye and the cornea both contribute to image formation.

Q: Your eye's iris changes the size of your pupil to adjust the amount of light that enters your eye.

Q: The colors you see with a prism result because the light is diffracted.

Q: Light goes slower through glass than through air.

Q: Light is a transverse wave.

Q: Dispersion results because the speed of light in a transparent medium varies with frequency.

Q: When you look into a pool of water, the depth looks less than it actually is because the light is dispersed.

Q: The path of a light ray through a refracting surface is reversible.

Q: A light ray can pass through a diverging lens without being deflected.

Q: A light ray bends when it goes from one medium to another because of diffraction.

Q: Blue light travels more slowly through glass than red light does.

Q: You see colors in a rainbow because of diffraction.

Q: Optical fibers work because of dispersion of light.

Q: Certain types of sunglasses are very effective at diminishing light reflected from surfaces because of polarization.

Q: When light passes through two or more narrow slits, an alternating dark and bright pattern is observed on a screen because of interference.

Q: Light spreads out when it passes through a narrow slit because of interference.

Q: Liquid crystal displays make use of interference of light.

Q: You do not see your image when you look at a flat rough aluminum surface because of specular reflection.

Q: You can see your image in a mirror because of diffuse reflection.

Q: A magnifying glass with focal length 15 centimeters is placed 12 centimeters above a stamp. (a) Where is the image? (b) What is the magnification? (c) Is the image produced a real or a virtual image?

Q: A movie projector is equipped with a 0.5-meter focal length lens that is positioned 0.506 meters from the film. (a) How far from the lens must the screen be if the image on it is to be in focus? (b) How many times larger is the image than the object? (c) Is the image produced a real or a virtual image?

Q: Match each item with the correct statement below.a. constructive interference i. liquid crystal displayb. converging j. magnificationc. convex mirror k. one-way mirrord. destructive interference l. parabolice. diffuse reflection m. realf. diffraction n. specular reflectiong. dispersion o. total internal reflectionh. diverging p. virtual1/ ideal shape for a telescope's primary mirror2/ mirrors use this3/ makes use of crossed polaroids4/ what keeps a light ray inside an optical fiber5/ occurs when light passes through a very narrow slit6/ occurs when two light waves arrive at a point out of phase7/ it is half-silvered8/ lens that is thicker at the center9/ the image height divided by the object height10/ occurs because the speed of light in a transparent substance is frequency dependent11/ type of image seen projected onto a screen12/ the type of mirror on the passenger side of modern automobiles

Q: If the object distance (s) is less than the focal length (f) then the image is ____________.

Q: The wavelength of a radio wave from an AM station broadcasting at 1,000 kilohertz on your radio dial is 300 meters.

Q: Gamma rays are emitted when high speed electrons decelerate as they are smashed into a metal target.

Q: Blue light has a longer wavelength than red light.

Q: Infrared radiation causes your skin to tan.

Q: EM waves travel at a speed that varies with their wavelength.

Q: Gamma radiation is the highest frequency of EM waves.

Q: Bones show up in x ray images because they absorb x rays more efficiently than muscle and other tissues do.

Q: X rays are used in radar.

Q: Blackbody radiation is emitted from a small hole in a furnace.

Q: The main form of radiation that our bodies emit is ultraviolet.

Q: The frequency of visible light determines its color.

Q: The increase in the amount of carbon dioxide in the atmosphere is responsible for the greenhouse effect.