Abo Exam Prep Questions & Answers
When discussing thick lenses, the factors which are considered in computing the lens power are: - ANSWER-Front curve, back curve, thickness and index
Which crown glass bifocal type will have the least chromatic aberration? - ANSWER-A "one piece" lens
Toric...
Abo Exam Prep Questions & Answers
When discussing thick lenses, the factors which are considered in computing the lens power are: -
ANSWER-Front curve, back curve, thickness and index
Which crown glass bifocal type will have the least chromatic aberration? - ANSWER-A "one piece" lens
Toric transposition shows: - ANSWER-Power in principal meridians
Increasing the diameter of a minus power lens always increases its: - ANSWER-Weight
The optical center of a round segment is located: - ANSWER-In the geometric center of the segment
The base curve of any multifocal lens is found on the surface containing the: - ANSWER-Segment
Normal slab-off (bicentric grind) is ground on the lens whose vertical meridian has the: - ANSWER-Least
plus power
The refractive error indicated by the Rx +1.75-2.75x090 is: - ANSWER-Mixed astigmatism
Tempering a lens by heat treating results in a lens being: - ANSWER-More resistant to impact
A slab-off lens is for the correction of: - ANSWER-Excessive prism imbalance at the reading level
Chem-tempering makes a clear glass lens more impact resistant by placing the lens in a potassium
nitrate bath. The lens undergoes a process known as: - ANSWER-Ion exchange
Which wavelengths of light have been indicated as possible contributors to the onset of cataracts? -
ANSWER-350-400nm
,When the lenses are laid out and marked for edging, the lenses are usually decentered so as to
correspond to the patient's pupillary distance after the lenses are inserted. This is done for the following
reason: - ANSWER-To avoid unwanted prism
If the identical bifocal prescription were made up in glass, (all parameters alike) which lens style would
be the heaviest? - ANSWER-Executive
Light falling on the front surface of a spectacle lens is: - ANSWER-Partially reflected, partially absorbed
and the remainder refracted
A concave mirror: - ANSWER-Can focus parallel incident rays to form a real image
White light is broken into its component colors when it is: - ANSWER-Diffracted or refracted
To the viewer, the image seen in a plane mirror appears to be: - ANSWER-As far behind the mirror as the
object is in front of it
The velocity of light is least in: - ANSWER-Flint glass
A lens dispersing white light into its component colors is an example of: - ANSWER-Chromatic aberration
The optical center of a lens is: - ANSWER-A lens location of zero deviation of the optical axis
Light rays passing through a prism are deviated: - ANSWER-Toward the base
Light travels outward in all directions from its source. The best explanation of this is light takes the form
of: - ANSWER-Wave fronts
The distance between the crest of one wave and the crest of the next one is called: - ANSWER-
Wavelength
, The interpretation of the range of wavelengths of visible light varies but is generally accepted as lying
between: - ANSWER-400 and 700nm
The breaking up of white light into its component colors by a lens or prism is called: - ANSWER-
Dispersion
The color in white light that is refracted the most after passing through a refracting test medium is: -
ANSWER-Violet
The reflection of light from a surface is most influenced by: - ANSWER-The regularity of the surface
Light rays originating at a distant point source are described as being: - ANSWER-Parallel
The incident ray, the reflected ray and the normal all lie: - ANSWER-In the same plane
The bending of a ray of light when it goes from one medium to another is called: - ANSWER-Refraction
A ray of light, passing from a dense to a less dense medium is bent: - ANSWER-Away from the normal
The concept or use of the term "normal" is that it is an imaginary line that is: - ANSWER-Perpendicular to
the medium's surface at the point of incidence of the ray
A correct statement regarding the law of refraction is that: - ANSWER-Light bends toward the normal
when it enters a medium denser than the one in which it was traveling
Any bundle of rays passing through a converging lens is made: - ANSWER-More converging
The ray that can pass through a lens without being refracted is called: - ANSWER-The axial ray
The angle of incidence, for which the angle of refraction is 90 degrees is called the: - ANSWER-Critical
angle
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