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Physics Optics
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55
Physics
Undergraduate 2
11/26/2010

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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
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 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
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 false
You 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, reduced
images 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 distance
IE 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 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
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
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