The range of wavelengths in the visible spectrum is? - ANSWER 400 - 800 nanometers
Immediately on either side of the visible spectrum are the invisible light segments of? - AN-
SWER Infrared & ultraviolet
Which color has the longest wavelength? - ANSWER Red
Geometric optics includes? - ANSWER The effects of media on the path of light
When light bounces back from an object, this is known as? - ANSWER Reflection
In reflection, the light rays that hit the object or interface between media with different indi-
ces of refraction are called? - ANSWER Incident rays
In optics, a medium (or media, plural) is: - ANSWER An object that reflects light
When light passes through a transparent medium, it may travel straight through (transmis-
sion) or its path may be altered. This altering or bending property of a medium is known as?
- ANSWER Refraction
The ray of light that enters a transparent medium is termed? - ANSWER Incident ray
If light passes through a lens and the rays are spread apart on exiting, this is known as? - AN-
SWER Divergence
1
,If light passes through a lens and the rays are spread toward each other on exiting, this is
known as? - ANSWER Convergence
A comparison of the speed of light in air to the speed of light through substance is? - AN-
SWER IR (Snell's Law)
The denser the substance, the more slowly light passes through it and the what? - AN-
SWER The higher the IR
The IR of crown glass is? - ANSWER 1.50
Light traveling through a prism will be bent toward the prisms what? - ANSWER Base
A 1.00 diopter prism bends light? - ANSWER 1 cm at a distance of 1m from the prism
The image of an object viewed through a prism Is what? - ANSWER Virtual and shifted to-
ward the apex
A 2.00 diopter prism displaces an object 1cm at a distance of what? - ANSWER 05 m
The displacement of an object 5cm at a distance of 1m would require prism of what? - AN-
SWER 5.0 diopters
At a distance of 2m, a 12 diopter prism would displace an object how far? - ANSWER
24cm
A spherical lens refracts light? - ANSWER Equally in every direction
2
,A 1.00 diopter spherical lens focuses light at? - ANSWER 1meter
The point at which a lens forms an image (whether real or virtual is the what? - ANSWER
focal point
True of false, regarding the optical center of a lens it always coincides with the geometric
center of the lens? - ANSWER False
The focal length of a lens is what? - 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? -
ANSWER Likewise virtual
What is the formula for finding the focal length? - ANSWER P = 1/F
What is the focal length of a 5 diopter lens? - ANSWER 0.2 m
A lens has a focal length of 33cm what is its dioptic power? - ANSWER 3 diopters
The direction of the line of light as focused by a plus power cylindrical lens is what? - AN-
SWER Aligned with the axis
Name 3 characteristics of a cylindrical lens? - ANSWER 1. They are used to correct astig-
matism
2. They have power in one axis, but no power in the axis 90 degrees away
3. They focus light in a line
3
, Light passing through a cylindrical lens is focused in 2 lines perpendicular to each other &
separated by an area known as what? - ANSWER Sturm's interval
The light rays in the Sturm's interval are projected in the shape of a what? - ANSWER
cone
Within the Conoid of Sturm the area where the image would be most clearly focused is? -
ANSWER The circle of lease confusion
An optical cross is a means of what? - ANSWER Indicating the dioptic power of a lens
The ocular media consists of? - ANSWER The tear film, cornea, humors & lens
Which ocular structure has the highest refractive power? - ANSWER Cornea
The primary goal of the eye's components is to what? - ANSWER Focus incoming light
onto the retina
Images pass through the optic nerve & thence to the what? - ANSWER Chiasm, optic
tract, lateral geniculate body, & optical cortex
When the ciliary muscle relaxes what happens? - ANSWER The lens is pulled thinner
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 - ANSWER It is required for viewing distant objects
With accommodation fully relaxed what is the pt's point of clearest vision? - ANSWER the
far point
4
Immediately on either side of the visible spectrum are the invisible light segments of? - AN-
SWER Infrared & ultraviolet
Which color has the longest wavelength? - ANSWER Red
Geometric optics includes? - ANSWER The effects of media on the path of light
When light bounces back from an object, this is known as? - ANSWER Reflection
In reflection, the light rays that hit the object or interface between media with different indi-
ces of refraction are called? - ANSWER Incident rays
In optics, a medium (or media, plural) is: - ANSWER An object that reflects light
When light passes through a transparent medium, it may travel straight through (transmis-
sion) or its path may be altered. This altering or bending property of a medium is known as?
- ANSWER Refraction
The ray of light that enters a transparent medium is termed? - ANSWER Incident ray
If light passes through a lens and the rays are spread apart on exiting, this is known as? - AN-
SWER Divergence
1
,If light passes through a lens and the rays are spread toward each other on exiting, this is
known as? - ANSWER Convergence
A comparison of the speed of light in air to the speed of light through substance is? - AN-
SWER IR (Snell's Law)
The denser the substance, the more slowly light passes through it and the what? - AN-
SWER The higher the IR
The IR of crown glass is? - ANSWER 1.50
Light traveling through a prism will be bent toward the prisms what? - ANSWER Base
A 1.00 diopter prism bends light? - ANSWER 1 cm at a distance of 1m from the prism
The image of an object viewed through a prism Is what? - ANSWER Virtual and shifted to-
ward the apex
A 2.00 diopter prism displaces an object 1cm at a distance of what? - ANSWER 05 m
The displacement of an object 5cm at a distance of 1m would require prism of what? - AN-
SWER 5.0 diopters
At a distance of 2m, a 12 diopter prism would displace an object how far? - ANSWER
24cm
A spherical lens refracts light? - ANSWER Equally in every direction
2
,A 1.00 diopter spherical lens focuses light at? - ANSWER 1meter
The point at which a lens forms an image (whether real or virtual is the what? - ANSWER
focal point
True of false, regarding the optical center of a lens it always coincides with the geometric
center of the lens? - ANSWER False
The focal length of a lens is what? - 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? -
ANSWER Likewise virtual
What is the formula for finding the focal length? - ANSWER P = 1/F
What is the focal length of a 5 diopter lens? - ANSWER 0.2 m
A lens has a focal length of 33cm what is its dioptic power? - ANSWER 3 diopters
The direction of the line of light as focused by a plus power cylindrical lens is what? - AN-
SWER Aligned with the axis
Name 3 characteristics of a cylindrical lens? - ANSWER 1. They are used to correct astig-
matism
2. They have power in one axis, but no power in the axis 90 degrees away
3. They focus light in a line
3
, Light passing through a cylindrical lens is focused in 2 lines perpendicular to each other &
separated by an area known as what? - ANSWER Sturm's interval
The light rays in the Sturm's interval are projected in the shape of a what? - ANSWER
cone
Within the Conoid of Sturm the area where the image would be most clearly focused is? -
ANSWER The circle of lease confusion
An optical cross is a means of what? - ANSWER Indicating the dioptic power of a lens
The ocular media consists of? - ANSWER The tear film, cornea, humors & lens
Which ocular structure has the highest refractive power? - ANSWER Cornea
The primary goal of the eye's components is to what? - ANSWER Focus incoming light
onto the retina
Images pass through the optic nerve & thence to the what? - ANSWER Chiasm, optic
tract, lateral geniculate body, & optical cortex
When the ciliary muscle relaxes what happens? - ANSWER The lens is pulled thinner
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 - ANSWER It is required for viewing distant objects
With accommodation fully relaxed what is the pt's point of clearest vision? - ANSWER the
far point
4
