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OPT 1400L > Quiz 4 > Flashcards

Quiz 4 Flashcards

1
Q

CR-39 is: -Tintable and scratch proof -Tintable and somewhat scratchable -Tintable and very thin -Somewhat scratchable and very thin

A

Tintable and somewhat scratchable

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2
Q

Polycarbonate is: -Low babe value -Used as a safety material -Light weight -All of these

A

All of these

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3
Q

High Index lenses are rarely used for: -Rimless glasses -Sunglasses -Safety glasses -Reading glasses

A

Safety Glasses

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4
Q

What is the approximate speed of light in air?

A

186,000 miles per second

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5
Q

What happens to light as it passes from air into a refractive material such as glass?

A

It slows down.

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6
Q

Index of refraction is a ratio of the speed of light in the material to the speed of light in:

A

Air.

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7
Q

Put the following lens materials in order of weight from heaviest to lightest: Glass High Index CR39 Polycarbonate

A

Glass, CR-39, High Index, Polycarbonate

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8
Q

Trifocals have how many focal points?

A

3

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9
Q

High Index is the most impact-resistant lens material True or False

A

False

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10
Q

Glass is the most scratch-resistant lens material. True or False

A

True

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11
Q

A stocked lens already prepared with a power is known as a ___________ lens.

A

Finished

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12
Q

To surface a prescription a/an ____________ lens should be selected.

A

Semi-Finished

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13
Q

The following is a disadvantage of glass: -High abbé value -Poor impact resistance -Light weight -Scratch Resistant

A

Poor Impact Resistance

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14
Q

The blank size of a lens is measured in ….

A

Millimeters.

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15
Q

The true curve of a lens is determined form the sag value. True or False

A

True

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16
Q

Which of the following images presents a semi-finished lens?

A
17
Q

Which of the following images presents a finished lens?

A
18
Q

A bifocal lens has:

A

.2 focal points

19
Q

Put the following lenses in order of Index of Refraction; lowest to highest. High Index, Crown Glass, CR-39, Polycarbonate, Trivex

A

CR-39, Crown Glass, Trivex, Polycarbonate, High-Index

20
Q

The following are advantages of glass: -Low abbé and resistant to scratching -Heavy and superior optics -Very scratchable and heavy -Superior optics and low chromatic aberration

A

Superior optics and low chromatic aberation

OPT 1400L (5 decks)

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