COT EXAM UPDATED ACTUAL
Questions and CORRECT Answers
The range of wavelengths in the visible spectrum is? - CORRECT ANSWER - 400 - 800
nanometers
Immediately on either side of the visible spectrum are the invisible light segments of? -
CORRECT ANSWER - Infrared & ultraviolet
Which color has the longest wavelength? - CORRECT ANSWER - Red
Geometric optics includes? - CORRECT ANSWER - The effects of media on the path of
light
When light bounces back from an object, this is known as? - CORRECT ANSWER -
Reflection
In reflection, the light rays that hit the object or interface between media with different indices of
refraction are called? - CORRECT ANSWER - Incident rays
In optics, a medium (or media, plural) is: - CORRECT ANSWER - 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? - CORRECT
ANSWER - Refraction
The ray of light that enters a transparent medium is termed? - CORRECT ANSWER -
Incident ray
,If light passes through a lens and the rays are spread apart on exiting, this is known as? -
CORRECT ANSWER - Divergence
If light passes through a lens and the rays are spread toward each other on exiting, this is known
as? - CORRECT ANSWER - Convergence
A comparison of the speed of light in air to the speed of light through substance is? - CORRECT
ANSWER - IR (Snell's Law)
The denser the substance, the more slowly light passes through it and the what? - CORRECT
ANSWER - The higher the IR
The IR of crown glass is? - CORRECT ANSWER - 1.50
Light traveling through a prism will be bent toward the prisms what? - CORRECT
ANSWER - Base
The image of an object viewed through a prism Is what? - CORRECT ANSWER - Virtual
and shifted toward the apex
A 1.00 diopter prism bends light? - CORRECT ANSWER - 1 cm at a distance of 1m from
the prism
A 2.00 diopter prism displaces an object 1cm at a distance of what? - CORRECT
ANSWER - 05 m
The displacement of an object 5cm at a distance of 1m would require prism of what? -
CORRECT ANSWER - 5.0 diopters
At a distance of 2m, a 12 diopter prism would displace an object how far? - CORRECT
ANSWER - 24cm
,A spherical lens refracts light? - CORRECT ANSWER - Equally in every direction
A 1.00 diopter spherical lens focuses light at? - CORRECT ANSWER - 1meter
The point at which a lens forms an image (whether real or virtual is the what? - CORRECT
ANSWER - focal point
True of false, regarding the optical center of a lens it always coincides with the geometric center
of the lens? - CORRECT ANSWER - False
The focal length of a lens is what? - CORRECT ANSWER - 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? -
CORRECT ANSWER - Likewise virtual
What is the formula for finding the focal length? - CORRECT ANSWER - P = 1/F
What is the focal length of a 5 diopter lens? - CORRECT ANSWER - 0.2 m
A lens has a focal length of 33cm what is its dioptic power? - CORRECT ANSWER -3
diopters
Name 3 characteristics of a cylindrical lens? - CORRECT ANSWER - 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? -
CORRECT ANSWER - 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? - CORRECT ANSWER - Sturm's interval
The light rays in the Sturm's interval are projected in the shape of a what? - CORRECT
ANSWER - cone
Within the Conoid of Sturm the area where the image would be most clearly focused is? -
CORRECT ANSWER - The circle of lease confusion
An optical cross is a means of what? - CORRECT ANSWER - Indicating the dioptic
power of a lens
The ocular media consists of? - CORRECT ANSWER - The tear film, cornea, humors &
lens
Which ocular structure has the highest refractive power? - CORRECT ANSWER - Cornea
The primary goal of the eye's components is to what? - CORRECT ANSWER - Focus
incoming light onto the retina
Images pass through the optic nerve & thence to the what? - CORRECT ANSWER -
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 - CORRECT ANSWER - It is required for viewing distant
objects
Questions and CORRECT Answers
The range of wavelengths in the visible spectrum is? - CORRECT ANSWER - 400 - 800
nanometers
Immediately on either side of the visible spectrum are the invisible light segments of? -
CORRECT ANSWER - Infrared & ultraviolet
Which color has the longest wavelength? - CORRECT ANSWER - Red
Geometric optics includes? - CORRECT ANSWER - The effects of media on the path of
light
When light bounces back from an object, this is known as? - CORRECT ANSWER -
Reflection
In reflection, the light rays that hit the object or interface between media with different indices of
refraction are called? - CORRECT ANSWER - Incident rays
In optics, a medium (or media, plural) is: - CORRECT ANSWER - 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? - CORRECT
ANSWER - Refraction
The ray of light that enters a transparent medium is termed? - CORRECT ANSWER -
Incident ray
,If light passes through a lens and the rays are spread apart on exiting, this is known as? -
CORRECT ANSWER - Divergence
If light passes through a lens and the rays are spread toward each other on exiting, this is known
as? - CORRECT ANSWER - Convergence
A comparison of the speed of light in air to the speed of light through substance is? - CORRECT
ANSWER - IR (Snell's Law)
The denser the substance, the more slowly light passes through it and the what? - CORRECT
ANSWER - The higher the IR
The IR of crown glass is? - CORRECT ANSWER - 1.50
Light traveling through a prism will be bent toward the prisms what? - CORRECT
ANSWER - Base
The image of an object viewed through a prism Is what? - CORRECT ANSWER - Virtual
and shifted toward the apex
A 1.00 diopter prism bends light? - CORRECT ANSWER - 1 cm at a distance of 1m from
the prism
A 2.00 diopter prism displaces an object 1cm at a distance of what? - CORRECT
ANSWER - 05 m
The displacement of an object 5cm at a distance of 1m would require prism of what? -
CORRECT ANSWER - 5.0 diopters
At a distance of 2m, a 12 diopter prism would displace an object how far? - CORRECT
ANSWER - 24cm
,A spherical lens refracts light? - CORRECT ANSWER - Equally in every direction
A 1.00 diopter spherical lens focuses light at? - CORRECT ANSWER - 1meter
The point at which a lens forms an image (whether real or virtual is the what? - CORRECT
ANSWER - focal point
True of false, regarding the optical center of a lens it always coincides with the geometric center
of the lens? - CORRECT ANSWER - False
The focal length of a lens is what? - CORRECT ANSWER - 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? -
CORRECT ANSWER - Likewise virtual
What is the formula for finding the focal length? - CORRECT ANSWER - P = 1/F
What is the focal length of a 5 diopter lens? - CORRECT ANSWER - 0.2 m
A lens has a focal length of 33cm what is its dioptic power? - CORRECT ANSWER -3
diopters
Name 3 characteristics of a cylindrical lens? - CORRECT ANSWER - 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? -
CORRECT ANSWER - 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? - CORRECT ANSWER - Sturm's interval
The light rays in the Sturm's interval are projected in the shape of a what? - CORRECT
ANSWER - cone
Within the Conoid of Sturm the area where the image would be most clearly focused is? -
CORRECT ANSWER - The circle of lease confusion
An optical cross is a means of what? - CORRECT ANSWER - Indicating the dioptic
power of a lens
The ocular media consists of? - CORRECT ANSWER - The tear film, cornea, humors &
lens
Which ocular structure has the highest refractive power? - CORRECT ANSWER - Cornea
The primary goal of the eye's components is to what? - CORRECT ANSWER - Focus
incoming light onto the retina
Images pass through the optic nerve & thence to the what? - CORRECT ANSWER -
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 - CORRECT ANSWER - It is required for viewing distant
objects
