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16 Cards in this Set
- Front
- Back
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The speed of light is:
A. 160,000 meters / second B. 186,000 meters / second C. 169,000 miles / hour D. 186,000 miles / second |
D. 186,00 miles / second
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The wavelength of 700nm is seen as what color:
A. Red B. Green C. Violet D. Blue |
A. Red
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In a minus powered lens light rays __ and come to a focal point __ the lens.
A. Converge, behind B. Converge, in front of C. Diverge, in front of D. Diverge, behind |
C. Diverge, in front of
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Light rays pass through a lens and converge at a point 50cm behind the lens, what is the power?
A. 0.20 D B. 0.02 D C. 2.00 D D. 0.50 D |
C. 2.00
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1 Prism Diopter can be described as deviating a ray of light:
A. 1 meter / 1 centimeter B.10 centimeters / 1000 centimeters C.1 millimeter / 1 meter D. 1 meter / 1 millimeter |
B. 10 centimeters / 1000 centimeters
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3 Prism Diopters base in on the right eye can also be described as:
A. 3@000 B. 3@180 C. 3@270 D. 3@090 |
A. 3@000
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Using Prentice's Rule a -4.00 lens must be decentered ___ to induce 1.00 Prism Diopter:
A. 1.0 mm B. 2.5 mm C. 10 mm D. 2.0 cm |
B. 2.5 mm
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The index of refraction is lowest in:
A. Air B. Water C. Plastic D. Glass |
A. Air
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When the direction of light changes as it passes from one medium to another, it is called:
A. Reflection B. Refraction C. Diffusion D. Retraction |
B. Refraction
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The focal length of a +2 diopter lens is:
A. +2 cm B. +5 cm C. +50 cm D. +2 meters |
C. +50cm
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A +3.00D lens has the following prismatic effect 8 mm below the optical center:
A. 2.4 base up B. 2.4 base down C. 2.4 base out D. 2.4 base in |
A. 2.4 base up
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One prism diopter _______ .
Focuses parallel light rays at: A. 40 cm B. Deviates a ray of light 1 cm at a distance of one meter C. Deviates a ray of light towards the apex D. Focuses parallel rays of light at one meter |
B. Deviates a ray of light 1 cm at a distance of one meter
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One of the ways of identifying a lens with minus power is to look for:
A. Parallel rays of light coming to a point focus behind lens B. Lens thicker in the center than the edge C. Objects seen through the lens are brighter D. Objects seen through the lens seem to move in the same direction as the lens is moving |
D. Objects seen through the lens seem to move in the same direction as the lens is moving
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The focal length of a lens may be altered by:
A. Making the lens smaller B. Making the lens larger C. Changing the curvature of one surface D. Coating the surface to prevent reflections |
C. Changing the curvature of one surface
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The P.D. written on the order is mistakenly noted as 70 mm, when the actual measurement should be 66 mm. What unwanted prism would be found in the prescription if the distance prescription is O.U. -15.00D sphere?
A. 3D base in each eye B. 3D base out each eye C. 2D base in each eye D. 2D base out each eye |
A. 3D base in each eye
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A +5.00 diopter lens decentered 2 mm creates ____ diopters of prism.
A. 0.1 B. 0.25 C. 2.5 D. 1 |
D. 1
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