ABO exam prep part 2 Questions And Answers Graded A+
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Module
ABO
Institution
ABO
The basic definition of a prism may be expressed mathematically as: - 1cm/1m=1 prism
Prentice's Rule states that the amount of induced prism equals to - Power of the lens times the
decentration in millimeters divide by 10
(prism= F x dec (mm) divided by 10)
A minus lens gets ________ the closer...
ABO exam prep part 2
The basic definition of a prism may be expressed mathematically as: - 1cm/1m=1 prism
Prentice's Rule states that the amount of induced prism equals to - Power of the lens times the
decentration in millimeters divide by 10
(prism= F x dec (mm) divided by 10)
A minus lens gets ________ the closer to the eye. - stronger
Axis is _______________________. - a notation of position in relation to the cornea and the
corrective lens. Axis notations have no value.
Decentering a minus lens outward will result in - Base in prism
Decentering a minus lens upward will result in - Base down prism
Decentering a plus lens inward will result in - Base out prism
Decentering a plus lens upward will result in - Base up prism
Eyeglass prescription powers are written in ___________________. - Diopters
High plus lenses create a peripheral distortion that causes objects to appear in what shape? -
Pincushion
If a converging lens has a focal length of +2 meters, its power is - Using formula (D=1/F)
D=1/+2
D=+0.50 m or +50cm or +500mm
, If a prism can displace an image one centimeter at a distance of one meter, it is said to have a power of -
1 prism diopter and the formula looks like this, 1cm/1m=1prism
If needed, prescriptions are written with an axis between ___________________. - 0-180
In a minus powered lens light rays ____ and come to a focal point ____ the lens. - Diverge, in front
of
A diverging lens produces a ________ image. - Virtual
When the direction of light is divided in the course of passing from one transparent medium to another
is known as: - Refraction
In simple terms all lenses are really ______________. - prisms
Light passing through a minus lensis said to be ___________. - diverging
Light passing through a plus lens is said to be ___________ . - converging
Light rays pass through a lens and converge at a point 50cm behind the lens, what is the power? -
D=1/f
D=1/50
D=+2.00
Light travels through a certain transparent medium at the rate of approximately 109,412 miles per
second. The index of refraction of this medium is - N(index of refraction)= speed of light in air/
Speed of light in the material
N=186,000/109,412
N=1.70
One meter is equal to ___________ inches. - 39.37
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