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
Debora [2.8K]
3 years ago
10

1.If a nearsighted person has a far point df that is 3.50m from the eye, what is the focal length f1 of the contact lenses that

the person would need to see an object at infinity clearly?
2.If a farsighted person has a near point that is 0.600m from the eye, what is the focal length f2 of the contact lenses that the person would need to be able to read a book held at 0.350m from the person's eyes?
Physics
2 answers:
Alla [95]3 years ago
8 0

Answer: a) -3.5m b) 0.22man

Explanation:

a) A near sighted person is a person that can only see near objects clearly but not far objects.

According to the lens formula

1/u+1/v = 1/f

where u = object distance (distance between the object and the lens)

v = image distance (distance between the image and the lens)

f = focal length of the lens

Given u= infinity v = 3.5m f= ?

1/f = 1/infinity +1/3.5

Since the lens used for correcting near sighted person is concave lens therefore the image distance is negative due to virtual image produced by the lens.

We then have 1/f1 = 1/infinity -1/3.5

f1 = -3.5m

b) A far sighted person is a person that can only see far objects clearly but not near objects.

According to the lens formula

1/u+1/v = 1/f

Given u= 0.35m v = 0.6m f2= ?

1/f2 = 1/0.35 + 1/0.6

Since the lens used for correcting far sighted person is convex lens therefore the image distance is positive due to mostly real image produced by the lens (reason why the image distance is positive.

f2 = 0.22m

svlad2 [7]3 years ago
4 0

1. The focal length f_1 of the contact lenses that the person would need to see an object at infinity clearly is -3.5m

2. The focal length f_2 of the contact lenses that the person would need to be able to read a book held at 0.350m from the person's eyes is  0.22m

<h3>Explanation: </h3>

1.

A nearsighted person is the people that able to read a book or see a computer screen easily but they will have difficulty seeing things across the room. In other words, nearsightedness or myopiais a vision condition in which people can see close objects clearly, but objects farther away appear blurred.

  • Near point of distance from eye(d_i) = 0.60 m
  • Distance he can read (d_o)= 0.350 m

The focal length f_1 of the contact lenses that the person would need to see an object at infinity clearly is

\dfrac{1}{f} = \dfrac{1}{d_1} + \dfrac{1}{d_f}\\\dfrac{1}{f} = \dfrac{1}{infinity} + \dfrac{1}{-3.5}\\\dfrac{1}{f} = 0+ \dfrac{1}{-3.5}\\ f = -3.5

2.

Farsightedness or hyperopia is a condition in which you can see distant objects clearly, but objects nearby may be blurry

u= 0.35m

v = 0.6m

f_2 = ?

\frac{1}{u} +\frac{1}{v} = \frac{1}{f}

\frac{1}{0.35} +\frac{1}{0.6} =\frac{1}{f_2}

f_2 = 0.22 m

The lens used to correct far sighted person is convex lens, therefore the image distance is positive because of real image mostly produced by the lens

Learn more about the focal length brainly.com/question/8679241

#LearnWithBrainly

You might be interested in
I will give Brainliest to WHoever answers truthfully!!!!!T/F net force charge and net electric force are the same thing
MakcuM [25]

Answer:

it's true I'm pretty sure

5 0
3 years ago
Read 2 more answers
What two factors could the students change to investigate how to increase and decrease the magnetic force between the paperclip
scoundrel [369]
..............................................A
4 0
2 years ago
A block slides along a frictionless surface with 220 J of kinetic energy. It then goes up a frictionless ramp. When the kinetic
aev [14]

Hello!

For the explanation of this energy conservation exercise, where we'll use <u>energy conservation law</u>, let's see what this principle proposes.

How you should know, mechanical energy conserves in every point, that is to say mechanical energy is same in A point like B point. (Mechanical energy will be represented by "Me")

Once time we know that, let's take the 220 Joules momentum like A point, and when 55 Joules momentum like B point.

Then, let's use the <u>energy conservation principle:</u>

Me(A) = Me(B)

  • We know Mechanical energy in A point, so just lets replace according to our data:

220 J = Me(B)

  • In B point, we know kinetic energy, but <u>we dont know gravitational potential energy</u>, so lets descompose Mechanical energy, into kinetic energy and gravitational potential energy:

220 J = Ke + Gpe

  • We know kinetic energy value, so lets replace it:

220 J = 55 J + Gpe

  • Finally, just clean Gpe and resolve it:

Gpe = 220 J - 55 J = 165 J

Gravitational potential energy is of One hundred sixty five Joules <u>(165 J).</u>

                                                                                  ║Sincerely, ChizuruChan║

8 0
2 years ago
A ball is thrown upward at a 45∘∘ angle. In the absence of air resistance, the ball follows a_________. A. A ball is thrown upwa
enot [183]

Answer:

C. parabolic Curve

Explanation:

The trajectory of a projectile motion is parabolic.

If a ball is thrown at angle of 45° to the horizontal then it will follow a parabolic curve during its motion as its a projectile motion. The other options are incorrect as sine curve is a periodic type of curve. linear curve and tangential curve are also out of place.So option C is correct

8 0
2 years ago
A machine exerts a 100 N force to the right over a 5.00 meter length in 4.00 seconds. Calculate the power output of this machine
Free_Kalibri [48]
500 but I could be wrong go with your gut my dude
6 0
2 years ago
Read 2 more answers
Other questions:
  • A student compresses the spring in a pop up toy .020 meter if the sprinf has a spring constant of 340 newtons per meter how much
    7·1 answer
  • Myoncedyret
    13·1 answer
  • Part A:
    15·2 answers
  • Is a type of passive transport that requires a pore or<br> channel to move solutes.
    6·1 answer
  • How are molecules in a neutral state different from ions?
    6·2 answers
  • Calculate the moment of inertia and the rotational kinetic energy for the following objects spinning about a central axis (in un
    7·1 answer
  • Una tortuga se desplaza en línea recta 100cm al norte y luego 80cm al este, determine su desplazamiento
    7·1 answer
  • Using the Particle Theory, explain why liquids are less compressible than gases.
    10·1 answer
  • PLZ help !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    5·1 answer
  • How can you show that an electric current has a magnet affect​
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!