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
Tju [1.3M]
3 years ago
11

Carol is farsighted ( presbyopia) and cannot see objects clearly that are closer to her eyes than about meter. She sees objects

clearly with a relaxed eye when they are distant. What is the refractive power of reading glasses that would allow her to read a book 50 cm away with a relaxed eye

Physics
2 answers:
Crank3 years ago
8 0

Answer:

+1.00 diopter

Explanation:

The power of a lens can be described simply as the reciprocal of the focal length of the lens measured in meters.

But f is unknown, hence we look for the focal length with the formula

1/f = 1/u + 1/v

where u is former near point = 100cm

v is the new intended near point = 50cm

1/f = 1/50 - 1/100

1/f = 1/100

f = 100 cm

Hence we get Power (D) = 1/f

where f = focal length of the lens in meter

From the question, the focal length of the lens = 100cm = 1m

Hence D = 1/1

D = +1.00

Hence the refractive power of the reading glasses that would allow Carol to read a book 50cm away from the relaxed eye will be +1.00 diopters.

egoroff_w [7]3 years ago
7 0

Answer:

1.0 dioptres

Explanation:

Farsightedness is an eye defect in which a person can see far objects clearly but not near objects. That implies that the patients' near point is farther than 25cm which is the normal least distance of distinct vision.

Farsightedness results from the eyeball being too long or the crystalline lens not being sufficiently converging.

Carol is farsighted with a near point of about a meter (100cm). We desire to make a lens to enable her near point be reduced to about 50cm. The focal length and power of this lens is calculated in the image attached.

The power of a lens is the inverse of its focal length in meters hence the 100 in the formula for power of the lens.

You might be interested in
A response to a touch on the palm of the hand observable in newborns is known as __________.
iVinArrow [24]
Softness u have too u can't grab them by their head either
6 0
3 years ago
The diagram shows an LED light bulb.
azamat
It’s d because it’s useful output which would be light over total input
7.5/8
7 0
2 years ago
Katherine johnson’s skill in what field led to nasa’s first moon voyage?
sertanlavr [38]
Answer: Katherine Johnson's knowledge of (mathematics) was instrumental in the return of the Apollo astronauts from the Moon to Earth.
4 0
2 years ago
The electric motor of a model train accelerates the train from rest to 0.620 m/s in 21ms. The total mass of the train is 825 g.
Rudiy27

Explanation:

Average power = change in energy / change in time

P = ΔE / Δt

P = (½ mv²) / t

P = (½ (0.825 kg) (0.620 m/s)²) / (0.021 s)

P = 7.55 Watts

7 0
2 years ago
Just say the letter of answer asap
kap26 [50]

answer  for number nine is C

Convergent boundaries: where two plates are colliding. Subduction zones occur when one or both of the tectonic plates are composed of oceanic crust.

Divergent boundaries – where two plates are moving apart. ...


Transform boundaries – where plates slide passed each other.

answer for number eight is d.

hope this help you

3 0
3 years ago
Read 2 more answers
Other questions:
  • The constant of proportionality between charge and voltage is the:________.
    15·1 answer
  • The girl is using her arm to lift a weight. Her arm is acting as a _______.
    14·1 answer
  • Which of these actions would increase heat transfer between two objects?
    13·2 answers
  • The net force on a rock is 250 newtons downward. The rock accelerates at a rate of 10 m/s2. What is the rock's mass?
    14·1 answer
  • A scientist is using an objective lens with 40X magnification on his microscope. If the ocular lens magnifies 10X, what is the t
    7·1 answer
  • What is the correct answer! Thank you for your help
    10·1 answer
  • Lol gn sleep well:))
    8·1 answer
  • Every few years, Earth passes through Saturn’s rings.
    10·1 answer
  • A rock is lying on a rock ledge that is 3 m high. The rock as 120 J of potential energy. What is the mass of the rock?
    11·1 answer
  • What constant acceleration is required to increase the speed of a car from 26 mi/h to 51 mi/h in 5 seconds
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!