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Volume 2 Course# OCPP 102 > Lens power > Flashcards

Lens power Flashcards

1
Q

Find the focal lengths of the given lenses.

a. D = +2.00D f = ___mm
b. D = +10.00D f = ___mm
c. D = -0.50D f = ___cm
d. D = -2.50D f = ___mm

A

a. f = .5 M
b. f = 100mm
c. f = 200cm
d. f = 400mm

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2
Q

Find the dioptric power of lenses having the following focal lengths.

a. f = +4.0 meters, D = ___
b. f = +20mm, D = ___
c. f = -333mm, D = ___
d. f = -25cm, D = ___

A

a. D = +0.25D
b. D = +50.00D
c. D = -3.00
d. D = -4.00

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3
Q

What is the dioptric power of a lens with a focal length of each of the following?

a. 25mm = ___
b. 2.5mm = ___
c. 25cm = ___

A

a. 40.00D
b. 400.00D
c. 4.00D

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4
Q

What is the focal length of a +5.00D lens in ___

a. Meters? = ___
b. Millimeters? = ___

A

a. .2

b. 200

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5
Q

What is the focal length of a +0.50D lens in ___

a. Centimeters? = ___
b. Meters? = ___

A

a. 200

b. 2

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6
Q

What dioptric power is required to focus at 40cm?

A

+2.50D

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7
Q

What is the focal length of a +3.00D lens in centimeters?

A

33cm

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8
Q

What is the power of a lens if it brings incident light to a focus 20mm away?

A

+50.00D

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9
Q

What is the focal length of a -0.50D lens?

A

-2M

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10
Q

What is the focal length of a -2.50D lens in centimeters?

A

-40cm

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11
Q

What is the power of a lens with a virtual focus 40mm away?

A

-25.00D

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12
Q

What is the power of a lens with real focus 4M away?

A

+0.25D

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13
Q

What is the focal length of a +10.00D lens in cm?

A

10cm

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14
Q

What is the focal length of a +1.00D lens in meters?

A

1M

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15
Q

A +2.50D lens will focus light ___ mm away.

A

400

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16
Q

A lens focuses light 4M away. What is the power of the lens?

A

+0.25D

17
Q

A minus lens has a focal length of 25cm. What power is the lens?

A

-4.00D

18
Q

A lens with a focal length of 80cm is a ___

A

+1.25D lens

19
Q

Find the nominal power

A

1

20
Q

Find the back surface

A

2

21
Q

Find the front surface

A

3

22
Q

4

A

-4.50D

23
Q

5

A

+7.00D

24
Q

6

A

-11.00D

25
Q

Sagittal depth is the straight-line distance between the back surface of a lens at its vault and the chord diameter of the lens.
true or false

A

true

26
Q

If the radius of a surface remains the same and the diameter changes, the thickness will change but the sagittal depth will remain the same.
true or false

A

false

27
Q

If the radius of a surface is reduced and the diameter remains the same, the thickness will be reduced.
true or false

A

true

28
Q

If the sagittal depth remains the same, and the diameter increases, the surface will become flatter.
true or false

A

true

29
Q

If the sagittal depth remains the same, and the diameter increases, the surface will become flatter.
true or false

A

true

Volume 2 Course# OCPP 102 (8 decks)

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