# Shared Flashcard Set

## Details

Physics Optics
n/a
55
Physics
11/26/2010

Term
 A negative focal length can be defined as:
Definition
 the distance from a diverging lens to a point fromwhich a parallel beam of light appears to diverge upon passing through the lens.
Term
 Focal length of a converging lens can be easily estimated by:
Definition
 focusing light from a distant source to a point and measuring the distance between this point and the lens
Term
 When light travels into water its frequency ____________ and its velocity _____________
Definition
 Frequency stays the same, Velocity changes
Term
 If the speed of light in water were not ________ , the rainbow would _______
Definition
 frequency dependent ----the rainbow would not occur
Term
 If you lay a magnifying glass on a printed page and move it away from the page, the image of the page is _______________ in the beginning and at some point becomes __________________.
Definition
 virtual image, real image
Term
 If you place a screen at the location of the virtual image, you __________ see the image on the screen.
Definition
 will not see the image on the screen
Term
 6) A light ray in air enters and passes through a flat-parallel slab of glass. What is a WRONGstatement about the ray after it emerges from the slab?A) The ray goes along a line parallel the line it used to go along before it entered glass.B) The ray is displaced from its original line by a distance, which increases with the angle ofincidence onto the glass surface.C) The ray is displaced from its original line by a distance proportional to the thickness of theslab.D) The ray is displaced from its original line by a distance, which decreases as the index ofrefraction of the glass increases.
Definition
 D) The ray is displaced from its original line by a distance, which decreases as the index ofrefraction of the glass increases.
Term
 4) Consider the interference pattern formed by 8 equally spaced narrow slits. How many minima are therebetween adjacent maxima?A) 4 B) 7 C) 8 D) 9
Definition
 B) 7
Term
 The intensity pattern resulting from interference of waves from two incoherent sources:
Definition
 The sum of intensities of the two waves
Term
 You do not see interference effects between front and back of your eye glasses due to:
Definition
 The short length of coherence of the regular light
Term
 To correct farsightedness (hyperopia), eyeglasses with ___________ are prescribed
Definition
 converging lenses
Term
 Most of the refraction in a human eye is provided by the ________, rather than by the __________
Definition
 cornea, lens
Term
 In people that are farsighted, objects that are up close focus __________.
Definition
 Behind the retina.
Term
 People that are nearsighted, objects that are far away focus __________________.
Definition
 In front of the retina.
Term
 In a two-slit apparatus, if the wavelength of light is doubled, the distance between the bright fringes is:
Definition
 doubled as well
Term
 Real image
Definition
 is on the same side as the outgoing light
Term
 Virtual Image
Definition
 when light only appears to come directly from the image location
Term
 You buy a mirror that is half your height, but affix it on the wall 2cm below its optimum location. How much of your image is cut off?
Definition
 4cm at the top
Term
 Spherical Aberration
Definition
 The slight distortion caused by the deviation from a perfect parabola
Term
 Any ray parallel to a mirror axis reflects through
Definition
 The focal point
Term
 Any ray that passes through the focal point of a mirror
Definition
 reflects parallel to the mirror axis.
Term
 Any ray through the center of curvature strikes the mirror __________ to the mirror surface and thus.....
Definition
 Normal.......reflects onto itself
Term
 The focal length of a spherical mirror is _________ the length of the radius of curvature.
Definition
 half
Term
 True or falseYou can form a real image with a convex mirror
Definition
 false
Term
 f>0 when the lens or mirror is ________ and f<0 when the lens or mirror is _______________.
Definition
 Converging, diverging
Term
 For a single lens or mirror the object distance is always _________
Definition
 positive
Term
 Image distance is ____ for a real image and ____ for a virtual image.
Definition
 positive for real, negative for virtual
Term
 If the outgoing light rays do not converge, the image is....
Definition
 virtual
Term
 The image distance is ________ for real images and __________ for virtual images.
Definition
 +/-
Term
 To correct myopia, eyeglasses with ________ lenses are prescribed, creating virtual, upright, reducedimages that are _________ to the eyes than the objects themselves
Definition
 diverging, closer
Term
 Nearsightedness (myopic) is caused by the image forming in front of the retina, causing distant objects to be blurred. Nearsighted is corrected by using ____________.
Definition
 Diverging corrective lenses
Term
 Farsighted (hyperopic) eyes, the image of nearby objects focus behind the retina so _____________ lenses are used.
Definition
 converging corrective lenses
Term
 The near point is ____________ .
Definition
 A distance where below the distance the eye can not focus.
Term
 Prescriptions for corrective lenses usually specify the corrective power in ____________ where the ___________(same as first one) is equal to ___________ the focal length in meters.
Definition
 Diopters, Diopters, Inverse of
Term
 The image size is equal to the size of the object if the object distance is equal to __________ the focal point.
Definition
 double the distanceIE l = 2f
Term
 The flatter the lens, the _________ the lens.
Definition
 weaker
Term
 Angular dimension of the moon is _______ than the angular dimension of the sun.
Definition
 Greater than
Term
 If you want to see better, you want the angular dimension to be _____________.
Definition
 large
Term
 A spyglass creates a __________ that is _____________ to the observer and has a ______________ angular dimension.
Definition
 virtual image, closer, larger
Term
 The index of refraction increases with increasing _____________ and decreases with increasing ____________.
Definition
 Frequency, Wavelength
Term
 Chromatic Aberration
Definition
 When a lens focuses different colors at different points
Term
 Dispersion of electromagnetic waves accounts for the fact that waves of difference frequencies __________________.
Definition
 Travel at different speeds in matter.
Term
 Inverted magnification is (inverted regular magnification, negative regular magnification)
Definition
 NEGATIVE
Term
 (T/F) For a given light beam in air normally incident upon flat interfaces with water and glass, the intensity ofreflection from water is higher than from glass. (The indices fo refraction of water and glass are 1.33 and1.52, respectively.
Definition
 False
Term
 A radio wave emitted by a vertical antenna has __________ polarization. Why?
Definition
 Vertical.
Term
 When light travels from air to glass its _____________ changes.
Definition
 Wavelength, Velocity (NOT FREQUENCY)
Term
 If two rays are refracted through a prism, and then projected onto a screen 1 meter away, the method for measuring the distance between the two rays on the screen is described as:
Definition
 Assume that the prism is small compared to the distance between the prism and the screen. Therefore Sinx ~= tanx~= x for small angles. Therefore the distance between the two rays is x * deltatheta.
Term
 l' is the image distance from the (object/lens)
Definition
 LENS
Term
 For a distant object, the image is at ______________.
Definition
 The focal point of the lens.
Term
 A lens can produce an upright magnified image on the same side from the lens as the objec
Definition
 True
Term
 A lens can produce an upright virtual image on the same side from the lens as the object
Definition
 True
Term
 A lens can produce an upright image at a distance from the lens that is smaller than its focal length
Definition
 True
Term
 A lens can produce an upright magnified real image
Definition
 FALSE
Term
 If r1 = r2 the two waves are going to produce oscillations that are __________and constructive.
Definition
 in phase, This is also true for r1 - r2 = m*(wavelength)
Term
 The oscillations will be out of phase and destructive if......
Definition
 r1-r2 is a multiple of half of the wavelength
Supporting users have an ad free experience!