Term
| A negative focal length can be defined as: |
|
Definition
the distance from a diverging lens to a point from
which 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 |
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Term
| If the speed of light in water were not ________ , the rainbow would _______ |
|
Definition
| frequency dependent ----the rainbow would not occur |
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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 |
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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 |
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Term
6) A light ray in air enters and passes through a flat-parallel slab of glass. What is a WRONG
statement 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 of
incidence onto the glass surface.
C) The ray is displaced from its original line by a distance proportional to the thickness of the
slab.
D) The ray is displaced from its original line by a distance, which decreases as the index of
refraction of the glass increases. |
|
Definition
D) The ray is displaced from its original line by a distance, which decreases as the index of
refraction of the glass increases. |
|
|
Term
4) Consider the interference pattern formed by 8 equally spaced narrow slits. How many minima are there
between adjacent maxima?
A) 4 B) 7 C) 8 D) 9 |
|
Definition
|
|
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
|
|
Term
| Most of the refraction in a human eye is provided by the ________, rather than by the __________ |
|
Definition
|
|
Term
| In people that are farsighted, objects that are up close focus __________. |
|
Definition
|
|
Term
| People that are nearsighted, objects that are far away focus __________________. |
|
Definition
|
|
Term
| In a two-slit apparatus, if the wavelength of light is doubled, the distance between the bright fringes is: |
|
Definition
|
|
Term
|
Definition
| is on the same side as the outgoing light |
|
|
Term
|
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
|
|
Term
|
Definition
| The slight distortion caused by the deviation from a perfect parabola |
|
|
Term
| Any ray parallel to a mirror axis reflects through |
|
Definition
|
|
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
|
|
Term
True or false
You can form a real image with a convex mirror |
|
Definition
|
|
Term
| f>0 when the lens or mirror is ________ and f<0 when the lens or mirror is _______________. |
|
Definition
|
|
Term
| For a single lens or mirror the object distance is always _________ |
|
Definition
|
|
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
|
|
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, reduced
images that are _________ to the eyes than the objects themselves |
|
Definition
|
|
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 distance
IE l = 2f |
|
|
Term
| The flatter the lens, the _________ the lens. |
|
Definition
|
|
Term
| Angular dimension of the moon is _______ than the angular dimension of the sun. |
|
Definition
|
|
Term
| If you want to see better, you want the angular dimension to be _____________. |
|
Definition
|
|
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
|
|
Term
|
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
|
|
Term
(T/F) For a given light beam in air normally incident upon flat interfaces with water and glass, the intensity of
reflection from water is higher than from glass. (The indices fo refraction of water and glass are 1.33 and
1.52, respectively. |
|
Definition
|
|
Term
| A radio wave emitted by a vertical antenna has __________ polarization. Why? |
|
Definition
|
|
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
|
|
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
|
|
Term
| A lens can produce an upright virtual image on the same side from the lens as the object |
|
Definition
|
|
Term
| A lens can produce an upright image at a distance from the lens that is smaller than its focal length |
|
Definition
|
|
Term
| A lens can produce an upright magnified real image |
|
Definition
|
|
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 |
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