Basic Optics
The breaking up of white light into its component colors is referred to as?
Dispersion
What is the spherical equivalent of +2.75 -3.00 x 180?
+1.25
One prism diopter deviates a ray of light 1 cm at a distance of?
1 meter
Transpose -2.00 – 1.75 x 153
-3.75 + 1.75 x 63
Bottom of eyewire out further than top?
Retroscopic tilt
The height or depth of a wave is called?
Amplitude
An object viewed through a concave lens will have what motion?
With motion
A minus lens moved downward from the primary position results in?
Base Up prism
Transpose -4.25 + 1.25 x 30
-3.00 -1.00 x 120
Imaginary triangle connecting ears and nose bridge?
Fitting triangle
The point on a lens through which a ray passes undeviated is called?
Optical center
The focal length in meters of a 5D lens is?
0.2 meters
Which direction must the center of a plus lens be moved to create base-out prism?
Out
Rx +2.25 – 1.00 x 90 Add +2.50
What is the Power of intermediate?
+3.50
Temple adjustment to move right lens closer?
Angle right temple out or left temple in
A theoretical diagram representing the total powers in a lens is called?
Optical cross or power cross
The focal length of an 8.00D lens in centimeters?
12.5 cm
The angle of incidence for which the angle of refraction is 90° is called?
Critical angle
What happens to the effective power of plus power when the lenses are moved closer to the eyes?
the effective power decrease
Effect if right temple is angled out?
Right side moves in toward right eye
A lens having one concave and one convex surface is called?
Meniscus lens
In this type of astigmatism one focal point falls on the retina while the other is behind it?
Simple Hyperopic Astigmatism
A -4.00 -1.00 x 180 lens decentered 5 mm too far IN creates?
2 prism diopters Base Out
What is the minimum lens thickness for Basic Impact and High Impact safety eyewear?
Instrument to measure vertex distance?
Distometer