NAO VOLUME 2 EXAM QUESTIONS
WITH CORRECT SOLUTIONS||100%
GUARANTEED PASS|| ALREADY A+
GRADED|||UPDATED 2026/2027
SYLLABUS||<<RECENT VERSION>>
Which lens has the characteristic of diverging light rays? - ANSWER ✓ minus
spherical
Which lens has the characteristic of with motion - ANSWER ✓ minus spherical
The lens design in which the front base is curved gradually flattens is called? -
ANSWER ✓ aspherical
Plus lenses are? - ANSWER ✓ thicker at the center than the edge
Which is a better product, a lens with a low Abbe value or a high Abbe value? -
ANSWER ✓ high Abbe value
What is the name of the instrument used to check to see if the glass lens has been
heat treated? - ANSWER ✓ Colmascope and Polariscope
What do you look for when you are trying to determine which lens material would
be thinner? - ANSWER ✓ highest index of refraction
How are glass lenses hardened? - ANSWER ✓ heating treating is done in two or
three minutes in a small furnace and chemical treating is done by immersing lenses
in molten salt
How long does the FDA require you keep a patients file? - ANSWER ✓ 3 years
The Federal Trade Commission established Eyeglasses I in 1978 and Eyeglasses II
in 1989. What is the difference? - ANSWER ✓ Eyeglasses I is the prescription
,release rule and list minimum information to be included in the RX. Eyeglasses II
no longer list minimum information needed to make spectacle RX
What does the FDA regulate for opticianry (exluding CL lens) and when did they
start doing it? - ANSWER ✓ Impact Resistance in 1971
A group of rays emitted from a small single point on a light source, it requires a
large hole in the second screen? - ANSWER ✓ Pencil
We use the acronym ROY G BIV to help remember the order of colors. It list
colors from? - ANSWER ✓ Long wavelengths to short wavelengths
Which wavelength of ultra-violet radiation is absorbed by the ozone layer? -
ANSWER ✓ UV-C
The bending or redirection of a light wave when it passes a barrier without
changing the medium in which it is traveling is called? - ANSWER ✓ Diffraction
When a light ray travels from one transparent medium to another, it changes
direction. This bending of light, which results from the differences in density of
different transparent materials is called? - ANSWER ✓ Refraction
When a ray of light travels from one material to another, if its direction of travel is
perpendicular or normal to the interface or junction between the materials it will? -
ANSWER ✓ change speed by not direction
When a ray of light travels from a less dense (faster) material to a more dense
(slower) material at an angle to the normal it will? - ANSWER ✓ bend toward the
normal
When a ray of light travels from a more dense (slower) material to a less dense
(faster) material at an angle to the normal it will? - ANSWER ✓ bend away from
the normal
If light travels through a liquid at 140,000 miles per second, what is the index of
liquid? - ANSWER ✓ 1.32
, If the optical center of lenses ( except for plano powers) are placed any place other
than directly in front of the patients visual axis...? - ANSWER ✓ prismatic effect
If a person moves his/her eyes away from the optical center of a lens to the left in
the following RX, what would occur to the patients vision? -1.00 sph OU -
ANSWER ✓ the patient would be viewing through a base in prism in the right
lens and base out prism in the left lens, but the resulting prism would be equal, and
although the image would be somewhat displaced, there would be no imbalance
When light strikes a prism, the light ray is bent (deviated) toward the base and the
image is displaced toward the - ANSWER ✓ apex
How far will 2 prism diopters deviate light at 1m? - ANSWER ✓ 2cm
When light passes from a medium of lesser density, such as air to a medium of
greater density, such as glass, the path of light is bent toward the? - ANSWER ✓
normal
The 2 theories of light that we primarily discuss are the _________ & _________.
- ANSWER ✓ Corpuscular & Electromagnetic Wave
Which light theory explains shadows? - ANSWER ✓ Corpuscular Theory
Which theory explains rainbows? - ANSWER ✓ Electromagnetic Wave Theory
What is the size of a nanometer? - ANSWER ✓ 1 billionth of a meter
What is the speed of light in air? - ANSWER ✓ 186,000 miles per second
A single band of light from a single point on light source is called a __________. -
ANSWER ✓ Ray
The visible spectrum is only a small portion of the electromagnetic spectrum and
consists of wavelengths from __________ to ___________. - ANSWER ✓ 380
nm to 750 nm
Which category of invisible light is the major cause of skin and ocular damage? -
ANSWER ✓ UV-A
WITH CORRECT SOLUTIONS||100%
GUARANTEED PASS|| ALREADY A+
GRADED|||UPDATED 2026/2027
SYLLABUS||<<RECENT VERSION>>
Which lens has the characteristic of diverging light rays? - ANSWER ✓ minus
spherical
Which lens has the characteristic of with motion - ANSWER ✓ minus spherical
The lens design in which the front base is curved gradually flattens is called? -
ANSWER ✓ aspherical
Plus lenses are? - ANSWER ✓ thicker at the center than the edge
Which is a better product, a lens with a low Abbe value or a high Abbe value? -
ANSWER ✓ high Abbe value
What is the name of the instrument used to check to see if the glass lens has been
heat treated? - ANSWER ✓ Colmascope and Polariscope
What do you look for when you are trying to determine which lens material would
be thinner? - ANSWER ✓ highest index of refraction
How are glass lenses hardened? - ANSWER ✓ heating treating is done in two or
three minutes in a small furnace and chemical treating is done by immersing lenses
in molten salt
How long does the FDA require you keep a patients file? - ANSWER ✓ 3 years
The Federal Trade Commission established Eyeglasses I in 1978 and Eyeglasses II
in 1989. What is the difference? - ANSWER ✓ Eyeglasses I is the prescription
,release rule and list minimum information to be included in the RX. Eyeglasses II
no longer list minimum information needed to make spectacle RX
What does the FDA regulate for opticianry (exluding CL lens) and when did they
start doing it? - ANSWER ✓ Impact Resistance in 1971
A group of rays emitted from a small single point on a light source, it requires a
large hole in the second screen? - ANSWER ✓ Pencil
We use the acronym ROY G BIV to help remember the order of colors. It list
colors from? - ANSWER ✓ Long wavelengths to short wavelengths
Which wavelength of ultra-violet radiation is absorbed by the ozone layer? -
ANSWER ✓ UV-C
The bending or redirection of a light wave when it passes a barrier without
changing the medium in which it is traveling is called? - ANSWER ✓ Diffraction
When a light ray travels from one transparent medium to another, it changes
direction. This bending of light, which results from the differences in density of
different transparent materials is called? - ANSWER ✓ Refraction
When a ray of light travels from one material to another, if its direction of travel is
perpendicular or normal to the interface or junction between the materials it will? -
ANSWER ✓ change speed by not direction
When a ray of light travels from a less dense (faster) material to a more dense
(slower) material at an angle to the normal it will? - ANSWER ✓ bend toward the
normal
When a ray of light travels from a more dense (slower) material to a less dense
(faster) material at an angle to the normal it will? - ANSWER ✓ bend away from
the normal
If light travels through a liquid at 140,000 miles per second, what is the index of
liquid? - ANSWER ✓ 1.32
, If the optical center of lenses ( except for plano powers) are placed any place other
than directly in front of the patients visual axis...? - ANSWER ✓ prismatic effect
If a person moves his/her eyes away from the optical center of a lens to the left in
the following RX, what would occur to the patients vision? -1.00 sph OU -
ANSWER ✓ the patient would be viewing through a base in prism in the right
lens and base out prism in the left lens, but the resulting prism would be equal, and
although the image would be somewhat displaced, there would be no imbalance
When light strikes a prism, the light ray is bent (deviated) toward the base and the
image is displaced toward the - ANSWER ✓ apex
How far will 2 prism diopters deviate light at 1m? - ANSWER ✓ 2cm
When light passes from a medium of lesser density, such as air to a medium of
greater density, such as glass, the path of light is bent toward the? - ANSWER ✓
normal
The 2 theories of light that we primarily discuss are the _________ & _________.
- ANSWER ✓ Corpuscular & Electromagnetic Wave
Which light theory explains shadows? - ANSWER ✓ Corpuscular Theory
Which theory explains rainbows? - ANSWER ✓ Electromagnetic Wave Theory
What is the size of a nanometer? - ANSWER ✓ 1 billionth of a meter
What is the speed of light in air? - ANSWER ✓ 186,000 miles per second
A single band of light from a single point on light source is called a __________. -
ANSWER ✓ Ray
The visible spectrum is only a small portion of the electromagnetic spectrum and
consists of wavelengths from __________ to ___________. - ANSWER ✓ 380
nm to 750 nm
Which category of invisible light is the major cause of skin and ocular damage? -
ANSWER ✓ UV-A
