NAO (Physics) VOLUME 3 QUESTIONS AND
ANSWERS CORRECTLY ANSWERED RATED A
The lower the Abbe number the ______
Correct Answer -less the chromatic aberration
The cylinder axis location tolerance for a 0.75Dcylinder prescription
ophthalmic lens is:
Correct Answer -5 degrees
The cylinder axis location tolerance for a 1.00D cylinder for prescription
ophthalmic lenses is:
Correct Answer -3 degrees
The cylinder axis location tolerance for a 2.00 D cylinder for prescription
opthalmic lens is:
Correct Answer -2 degrees
The prism power tolerance for uncut multifocal and edged lenses for
prescription ophthalmic lenses is:
Correct Answer -+ or - 1/3 prism diopter
The prism power tolerance for a mounted pair of eyeglasses in the vertical
meridian for prescription ophthalmic lenses is:
Correct Answer -1/3 prism diopter
,The prism tolerance for a mounted pair of eyeglasses in the horizontal
meridian for prescription ophthalmic lenses is:
Correct Answer -2/3 prism diopter
The tolerance for lens thickness when specified for special prescription
purposes is:
Correct Answer -0.3 mm
The tolerance for specified base curve is
Correct Answer -0.75 diopter
The segment location tolerance in the vertical (segment height)meridian in a
mounted pair of eyeglasses is:
Correct Answer -Pairs should match within 1.0 mm of specifications
The tolerance of the cylinder axis location of the right lens is:
RX: OD +1.00 +2.00 x 090
OS +3.00 +1.00 x 180
Add +2.00 OU, FT-28
Correct Answer -2 degrees
The specifications for the Food and Drug Administration (FDA) dress drop-
ball test are:
Correct Answer -5/8 inch steel ball, dropped 50 inches
, A patient is wearing a +9.50D contact lens. What power lens would be
needed in glasses to beworn at 12 mm?
Correct Answer -+10.50
If the lenometer reads a power of -2.00D in the 45th meridian and +0.50 in
the 135th, the lens power would be:
Correct Answer -+0.50 -1.50 x 135
The reading for RX for a -4.25 -1.25 x 090 +2.00 addi is;
Correct Answer --3.50 +1.25 x 180
If in the lensometer the distance portion of an eyeglass lens is -2.00, and the
reading in the bifocal segment is +1.00D, then the bifocal add power is
Correct Answer -+3.00D
If the RX is -1.25 -2.00 x 030, what is the total power at axis 090?
Correct Answer --2.75
Which of the following statements about mirrors is true of a real image?
Correct Answer -real images are always located behind the mirror
Two plane mirrors are attached to form a dual mirror system with an
adjustment angle. As the angle between the mirrors increases, the number
of images _____:
Correct Answer -decreases
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