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OCPP BOOK 2 TEST: Questions With Complete Solutions
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OCPP BOOK 2 TEST: Questions With Complete Solutions
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OCPP BOOK 2 TEST: Questions With CompleteSolutions
How much accommodative ability does the average person have at birth?
Right Ans - 15.00D
Objects appear to focus in front of a _____ lens. Right Ans - minus
When a ray of light leaves crown glass, its angle with the normal to the surface
is only 8 degrees. If it has an angle of refraction of 12 degrees, what is the
angle of deviation when it leaves the glass? Right Ans - -4 degrees
which frame material begins as granules that are heated until liquid and then
injection-molded to the desired frame? Right Ans - Propionate
If light of about 550 millimicrons reaches your eyes, you will have a sensation
of seeing ? Right Ans - green
If a glass rod is surrounded by another medium of the same index of
refraction, then the rod will be_____ Right Ans - partly visible depending on
the viewing angle
Plus lenses _____ Right Ans - show against motion
Progressive power can change from distance to near zones in either a rapid or
slow fashion. If it changes in a rapid fashion, then which of the following does
not occur? Right Ans - the lens has a short progressive corridor
the index of refraction of cr-39 is Right Ans - 1.49
this aberration results in a slight blurring of the image due to the fact that a
lens will have the tendency to focus light rays from the periphery sooner than
the rays passing through the central portion of the lens _____ Right Ans -
spherical
the fitting cross for a general purpose progressive addition lens would be
fitted higher than specified by the lens manufacturer in which of the following
, cases? Right Ans - If the progressive lens is used to inhibit accommodavtive
esotropia in children
In a plus lens with aspheric design the surface curvature ____ Right Ans -
flattens from center to edge
what i the dioptric power of a lens with a foal length of -33.3mm? Right Ans
- +30.00D
when children are fitted with progressive addition lenses,yet still have the
ability to accommodate just as other children do, the fitting cross is usually set
________ Right Ans - 4mm above the pupil center
it makes sense to utilize aspheric lenses in many dispensing situations since
they ______ Right Ans - will create a more cosmetically appealing lens
although all of the factors listed below are important i the fitting of
progressive lenses, which factor has the most influence on wearer
satisfaction? Right Ans - fitting accuracy
visible light is in the range of wave lengths approximately: Right Ans - 380
to 760 nanometers
which progressive addition lens is specifically designed for frames with a
narrow B dimension? Right Ans - soft design
light traveling through air encounters a second medium which slows the light
to 100,000 miles/second. what is the index of the second medium? Right
Ans - 1.86
which metal frame material is lightweight and can be finished in a variety of
colors? Right Ans - aluminum
when a ray of light travels from a less dense medium to a kenser medium, r is
less than i and d is positive: Right Ans - true
which frame material has high flexibility that will maintain that flexibility
when occasionally soaked in water overnight? Right Ans - nylon
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