1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
vladimir1956 [14]
3 years ago
7

Andrea's near point is 20.0 cm and her far point is 2.0 m. Her contact lenses are designed so that she can see objects that are

infinitely far away. What is the closest distance that she can see an object clearly when she wears her contacts?
Physics
1 answer:
Shalnov [3]3 years ago
4 0

Answer:

the closest distance that she can see an object clearly when she wears her contacts is 22.2 cm

Explanation:

Given the data in the question,

near point = 20 cm

far point = 2 m = 200 cm

Now, for an object that is infinitely far away, the image is at is its far point.

so using the following expression, we can determine the focal length

1/f = 1/i + 1/o

where f is the focal length, i is the image distance and o is the object distance.

here, far point i = 2 m = 200 cm  and v is ∞

so we substitute

1/f = 1/(-200 cm)  +  1/∞

f = -200 cm

Also, for object at its closest point, the image appear at near point,

so

1/f = 1/i + 1/o

we make o the subject of formula

o = ( i × f ) / ( i - f )

given that near point i = 20 cm

we substitute

o = ( -20 × -200 ) / ( -20 - (-200) )

o = 4000 / 180

o = 22.2 cm

Therefore, the closest distance that she can see an object clearly when she wears her contacts is 22.2 cm

You might be interested in
Noise-canceling headphones are an application of destructive interference. Each side of the headphones uses a microphone to pick
exis [7]
The question for this problem would be the minimum headphone delay, in ms, that will cancel this noise.
The 200 Hz. period = (1/200) = 0.005 sec. It will need to be delayed by 1/2, so 0.005/2, that is = 0.0025 sec. So converting sec to ms, will give us the delay of:Delay = 2.5 ms.
4 0
3 years ago
What is one property of iodine
mamaluj [8]

Answer: I2

Explanation:

6 0
3 years ago
Is the matching correct?
iragen [17]

Yes thats right :)

have a great day!!!


7 0
3 years ago
The football team is selling mulch as a fundraiser. Which two options are
satela [25.4K]
Noise does not affect the digital signal making it more reliable
3 0
2 years ago
Read 2 more answers
What happens to a planes wing when air moves taster over the top of?
Anon25 [30]

Answer:

it begins to decrease it's altitude​

Explanation:

5 0
3 years ago
Other questions:
  • Volume of an block is 5 cm3. If the density of the block is 250 g/cm3, what is the mass of the block ?​
    12·1 answer
  • An impala is an African antelope capable of a remarkable vertical leap. In one recorded leap, a 45 kg impala went into a deep cr
    6·1 answer
  • Where are the nucleus and the electrons located in this atom
    9·1 answer
  • The atomic mass is important because?
    14·1 answer
  • find the average velocity of a bicycle that starts 100km south and is 120km south of town after 0.4 hours​
    12·1 answer
  • Help?step by step/no need
    11·1 answer
  • In the oxygen cycle, oxygen is
    10·1 answer
  • Can someone explain please <br> ???
    10·1 answer
  • What is the operating life time of a PV Module?
    8·1 answer
  • How does the electric force between two charged particles change if the
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!