COT EXAM QUESTIONS AND FULL
SET CORRECT ANSWERS| UPDATED
The range of wavelengths in the visible spectrum is? - Ans--400 - 800
nanometers
Immediately on either side of the visible spectrum are the invisible light
segments of? - Ans--Infrared & ultraviolet
Which color has the longest wavelength? - Ans--Red
Geometric optics includes? - Ans--The effects of media on the path of light
When light bounces back from an object, this is known as? - Ans--Reflection
In reflection, the light rays that hit the object or interface between media with
different indices of refraction are called? - Ans--Incident rays
In optics, a medium (or media, plural) is: - Ans--An object that reflects light
When light passes through a transparent medium, it may travel straight
through (transmission) or its path may be altered. This altering or bending
property of a medium is known as? - Ans--Refraction
The ray of light that enters a transparent medium is termed? - Ans--Incident
ray
If light passes through a lens and the rays are spread apart on exiting, this is
known as? - Ans--Divergence
If light passes through a lens and the rays are spread toward each other on
exiting, this is known as? - Ans--Convergence
A comparison of the speed of light in air to the speed of light through
substance is? - Ans--IR (Snell's Law)
,The denser the substance, the more slowly light passes through it and the
what? - Ans--The higher the IR
The IR of crown glass is? - Ans--1.50
Light traveling through a prism will be bent toward the prisms what? - Ans--
Base
The image of an object viewed through a prism Is what? - Ans--Virtual and
shifted toward the apex
A 1.00 diopter prism bends light? - Ans--1 cm at a distance of 1m from the
prism
A 2.00 diopter prism displaces an object 1cm at a distance of what? - Ans--
05 m
The displacement of an object 5cm at a distance of 1m would require prism
of what? - Ans--5.0 diopters
At a distance of 2m, a 12 diopter prism would displace an object how far? -
Ans--24cm
A spherical lens refracts light? - Ans--Equally in every direction
A 1.00 diopter spherical lens focuses light at? - Ans--1meter
The point at which a lens forms an image (whether real or virtual is the what?
- Ans--focal point
True of false, regarding the optical center of a lens it always coincides with
the geometric center of the lens? - Ans--False
The focal length of a lens is what? - Ans--The distance between the lens and
the focal point
,Because the focal point of a minus lens is virtual, the focal length of a minus
lens is what? - Ans--Likewise virtual
What is the formula for finding the focal length? - Ans--P = 1/F
What is the focal length of a 5 diopter lens? - Ans--0.2 m
A lens has a focal length of 33cm what is its dioptic power? - Ans--3 diopters
Name 3 characteristics of a cylindrical lens? - Ans--1. They are used to
correct astigmatism
2. They have power in one axis, but no power in the axis 90 degrees away
3. They focus light in a line
The direction of the line of light as focused by a plus power cylindrical lens is
what? - Ans--Aligned with the axis
Light passing through a cylindrical lens is focused in 2 lines perpendicular to
each other & separated by an area known as what? - Ans--Sturm's interval
The light rays in the Sturm's interval are projected in the shape of a what? -
Ans--cone
Within the Conoid of Sturm the area where the image would be most clearly
focused is? - Ans--The circle of lease confusion
An optical cross is a means of what? - Ans--Indicating the dioptic power of a
lens
The ocular media consists of? - Ans--The tear film, cornea, humors & lens
Which ocular structure has the highest refractive power? - Ans--Cornea
The primary goal of the eye's components is to what? - Ans--Focus
incoming light onto the retina
Images pass through the optic nerve & thence to the what? - Ans--Chiasm,
optic tract, lateral geniculate body, & optical cortex
, All of the following are true regarding the accommodative reflex except: It is
stimulated by a blurred image, It is not a true reflex, It is required for viewing
distant objects or it includes convergence, miois & focusing - Ans--It is
required for viewing distant objects
When the ciliary muscle relaxes what happens? - Ans--The lens is pulled
thinner
The main reason one's accommodation ability decreases with age is due to
what? - Ans--Hardening of the crystalline lens
With accommodation fully relaxed what is the pt's point of clearest vision? -
Ans--the far point
the power of a myopic eye itself is what? - Ans--plus
the retinoscope provides information on the pt's refractive status by doing
what? - Ans--reflecting light off the pts' retina
the streak retinoscope permits what? - Ans--neutralization of individual
ocular meridians
all of the following are components of the streak retinoscope except which
one?
light & power sources
condensing lens & mirror
rotating lens system
focusing sleeve - Ans--rotating lens system
raising or lowering the focus sleeve of a streak retinoscope does what? -
Ans--changes the vergence of the light leaving the instrument
the plane mirror effect is used in streak retinoscopy because? - Ans--this
projects parallel light rays into the eye
if a streak retinoscope is habitually placed flat on the table what will happen?
- Ans--the filament may bend causing a distorted streak
SET CORRECT ANSWERS| UPDATED
The range of wavelengths in the visible spectrum is? - Ans--400 - 800
nanometers
Immediately on either side of the visible spectrum are the invisible light
segments of? - Ans--Infrared & ultraviolet
Which color has the longest wavelength? - Ans--Red
Geometric optics includes? - Ans--The effects of media on the path of light
When light bounces back from an object, this is known as? - Ans--Reflection
In reflection, the light rays that hit the object or interface between media with
different indices of refraction are called? - Ans--Incident rays
In optics, a medium (or media, plural) is: - Ans--An object that reflects light
When light passes through a transparent medium, it may travel straight
through (transmission) or its path may be altered. This altering or bending
property of a medium is known as? - Ans--Refraction
The ray of light that enters a transparent medium is termed? - Ans--Incident
ray
If light passes through a lens and the rays are spread apart on exiting, this is
known as? - Ans--Divergence
If light passes through a lens and the rays are spread toward each other on
exiting, this is known as? - Ans--Convergence
A comparison of the speed of light in air to the speed of light through
substance is? - Ans--IR (Snell's Law)
,The denser the substance, the more slowly light passes through it and the
what? - Ans--The higher the IR
The IR of crown glass is? - Ans--1.50
Light traveling through a prism will be bent toward the prisms what? - Ans--
Base
The image of an object viewed through a prism Is what? - Ans--Virtual and
shifted toward the apex
A 1.00 diopter prism bends light? - Ans--1 cm at a distance of 1m from the
prism
A 2.00 diopter prism displaces an object 1cm at a distance of what? - Ans--
05 m
The displacement of an object 5cm at a distance of 1m would require prism
of what? - Ans--5.0 diopters
At a distance of 2m, a 12 diopter prism would displace an object how far? -
Ans--24cm
A spherical lens refracts light? - Ans--Equally in every direction
A 1.00 diopter spherical lens focuses light at? - Ans--1meter
The point at which a lens forms an image (whether real or virtual is the what?
- Ans--focal point
True of false, regarding the optical center of a lens it always coincides with
the geometric center of the lens? - Ans--False
The focal length of a lens is what? - Ans--The distance between the lens and
the focal point
,Because the focal point of a minus lens is virtual, the focal length of a minus
lens is what? - Ans--Likewise virtual
What is the formula for finding the focal length? - Ans--P = 1/F
What is the focal length of a 5 diopter lens? - Ans--0.2 m
A lens has a focal length of 33cm what is its dioptic power? - Ans--3 diopters
Name 3 characteristics of a cylindrical lens? - Ans--1. They are used to
correct astigmatism
2. They have power in one axis, but no power in the axis 90 degrees away
3. They focus light in a line
The direction of the line of light as focused by a plus power cylindrical lens is
what? - Ans--Aligned with the axis
Light passing through a cylindrical lens is focused in 2 lines perpendicular to
each other & separated by an area known as what? - Ans--Sturm's interval
The light rays in the Sturm's interval are projected in the shape of a what? -
Ans--cone
Within the Conoid of Sturm the area where the image would be most clearly
focused is? - Ans--The circle of lease confusion
An optical cross is a means of what? - Ans--Indicating the dioptic power of a
lens
The ocular media consists of? - Ans--The tear film, cornea, humors & lens
Which ocular structure has the highest refractive power? - Ans--Cornea
The primary goal of the eye's components is to what? - Ans--Focus
incoming light onto the retina
Images pass through the optic nerve & thence to the what? - Ans--Chiasm,
optic tract, lateral geniculate body, & optical cortex
, All of the following are true regarding the accommodative reflex except: It is
stimulated by a blurred image, It is not a true reflex, It is required for viewing
distant objects or it includes convergence, miois & focusing - Ans--It is
required for viewing distant objects
When the ciliary muscle relaxes what happens? - Ans--The lens is pulled
thinner
The main reason one's accommodation ability decreases with age is due to
what? - Ans--Hardening of the crystalline lens
With accommodation fully relaxed what is the pt's point of clearest vision? -
Ans--the far point
the power of a myopic eye itself is what? - Ans--plus
the retinoscope provides information on the pt's refractive status by doing
what? - Ans--reflecting light off the pts' retina
the streak retinoscope permits what? - Ans--neutralization of individual
ocular meridians
all of the following are components of the streak retinoscope except which
one?
light & power sources
condensing lens & mirror
rotating lens system
focusing sleeve - Ans--rotating lens system
raising or lowering the focus sleeve of a streak retinoscope does what? -
Ans--changes the vergence of the light leaving the instrument
the plane mirror effect is used in streak retinoscopy because? - Ans--this
projects parallel light rays into the eye
if a streak retinoscope is habitually placed flat on the table what will happen?
- Ans--the filament may bend causing a distorted streak
