Basic Math

Question 1

What is the metric system?

Answer 1

Is the common unit of measure in optics
(optical formulas and frame parts use the metric system)

Question 2

What is 39.37 inches in meters?

Answer 2

1 METER

Question 3

What is 2.5 centimeters in inches?

Answer 3

1 INCHES

Question 4

What is 1 meter equal to in decimeters?

Answer 4

10

Question 5

What is 1 meter equal to in centimeters?

Answer 5

100

Question 6

What is 1 meter equal to in Millimeters?

Answer 6

1,000

Question 7

tips: when thinking of the word “meter” …

Answer 7

Think of metric system

Question 8

When seeing “Deci” what is the prefix?

Answer 8

“Deci” is the prefix that mean “ten”

Question 9

When seeing “Centi” what is the prefix?

Answer 9

“Centi” is the prefix that means “100”

Question 10

When seeing “Milli” what is the prefix?

Answer 10

“Milli” is the prefix that means “1,000”

Question 11

What is smaller between the millimeters or centimenters?

Answer 11

Millimeter is smaller than centimeters

Question 12

What do you do when converting Larger units to Smaller units?

Answer 12

Move the Decimal right

Question 13

What do you do when converting smaller units to larger units?

Answer 13

Move the decimal left

Question 14

Convert 3 meters to Millimeters

Answer 14

Smaller metric units, move the decimal right
Answer: 3000 millimeters

Question 15

Convert 8 millimeters to meters

Answer 15

Larger metric unit, move the decimal left

Answer:0.008 meters

Question 16

Convert 3 CENTImeters to MILLImeters.

Answer 16

Smaller metric unit, move the decimal right

Answer: 30 Millimeters

Question 17

Convert 6 Millimeter to centimeters.

Answer 17

Larger metric unit move the decimal left

Answer: 0.6 centimeters

Question 18

When adding two plus numbers what will the result have?

Answer 18

It will always have a plus number as the result.

Question 19

What is +2.00 (+) +0.50?

Answer 19

+2.50

Question 20

What is +3.75 (+) +0.75?

Answer 20

+4.50

Question 21

When adding two minus numbers what will the result have?

Answer 21

It will always have a minus number

Question 22

What is -2.00 (+) -0.50?

Answer 22

-2.50

Question 23

What is -3.75 (+) -0.75?

Answer 23

-4.50

Question 24

When adding a plus and minus number what will happen?

Answer 24

It will always result in the sign being the same as the sign of the larger number

Question 25

What is -2.00 (+) +0.50?

Answer 25

-1.50

Question 26

What is +3.75 (+) - 0.75?

Answer 26

+3.00

Question 27

What is the formula of finding the Lens Power?

Answer 27

f1+f2= total power Front lens+Back lens= Total Lens Power

Question 28

Use the Lens Power for the numbers below: F1 = +8.00D F2 = -5.00D

Answer 28

+3.00D

Question 29

Use the Lens Power for the numbers below: F1 = +2.00D F2 = -4.00D

Answer 29

-2.00D

Question 30

Use the Lens Power for the numbers below: F1 = +4.75D F2 (middle) = -2.25D F2 (top) = -3.50D

Answer 30

Middle : +2.50 Top: =1.25D

Question 31

What happens to the result when multiplying and diving the same sign?

Answer 31

The answer will always be a plus sign

Question 32

What is plus x plus = ?

Answer 32

plus

Question 33

What is plus / plus = ?

Answer 33

plus

Question 34

What is minus x minus = ?

Answer 34

Plus

Question 35

What is minus / minus = ?

Answer 35

Plus

Question 36

What is 25 x 3 = ?

Answer 36

75

Question 37

What is (-25)x(-3)= ?

Answer 37

75

Question 38

What is 100/5= ?

Answer 38

20

Question 39

What is (-100)/(-5)=?

Answer 39

20

Question 40

What happens when you multiply and/or divide difference signs?

Answer 40

It will usually be a minus

Question 41

What is plus x minus= ?

Answer 41

Minus

Question 42

What is plus / minus =?

Answer 42

Minus

Question 43

What is minus /plus=?

Answer 43

Minus

Question 44

What is 25 x (-3) =?

Answer 44

-75

Question 45

What is (-100) / 5 =?

Answer 45

-20

Question 46

What is 100/ (-5) = ?

Answer 46

-20

Question 47

A prescription requires 1.00D prism in a 2.00D lens. How much decentration is required?

Answer 47

/\ = power x decentration distance in cm Steps: 1.00=2.00x ? Subtract 2.00 from both side which cancel out the 2.00 from the left and makes the 1.00 from the right be.... Answer:1/2 or 0.5 cm = ?

Question 48

What is the power of the lens with a 1.0 diopter prims that displaces an object 5mm?

Answer 48

/\ = power x decentration distance in cm 1.00 = ? x 0.5cm Divide 0.5 from both sides which cancel out 0.5 from the right and 1.00 from the right becomes... Answer: 2.00 = ?

Question 49

How much will a 2.00D Prism displace light at a distance of 1m?

Answer 49

1/\=1cm/1m 2/\= ?/1m Multiply 1 from both sides which will cancel out the 1m from the right and 2/\ from the left will become.. Answer: 2=?

Question 50

A 2.00D prism displaces light 2 cm at what distance?

Answer 50

1/\=1cm/1m 2/\= 2cm/ ? Multiply ? from both sides which will cancel out the ? from the right and 2/\ from the left will become.. (?)2/\ = 2 cm Divide 2 from both sides which cancel out 2 in (?)2/\ from the left which leaves (?)/\ but the right which is 2cm/2 will become ... Answer: ? = 1

Question 51

Turn this fraction to a decimal. 1/4

Answer 51

0.25

Question 52

Turn this fraction to a decimal. 1/2

Answer 52

0.50

Question 53

Turn this fraction to a decimal. 3/4

Answer 53

0.75

Question 54

Turn this fraction to a decimal. 1/3

Answer 54

Rounds to 0.33

Question 55

What is the formula to predict image displacement?

Answer 55

P= C/D p- Prism c- displacement in cm d- distance from prism in meters

Question 56

What is the power of a prism that displaces light 1 cm at a distance of 0.5 meter?

Answer 56

P= C/D P= 1cm / 0.5m P=2.00D

Question 57

What is the formula used to calculate focal length?

Answer 57

f= 1/F f- focal length F- lens power in diopters D- distance from prism in meters

Question 58

What is the focal length of a +2.00D lens?

Answer 58

f= 1/F F= 1/2 f= 0.5m real

Question 59

What is the focal length of a -4.00D lens?

Answer 59

f= 1/F f=1/4 f= 0.25m virtual

Question 60

What is the power of a lens with a virtual 2m focal length?

Answer 60

F=1/f F= 1/2 F= -0.50D