This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: A person having a near point of 25 cm and a far point at infinity uses a converging lens of focal ... (Read 191 times)

berenicecastro

  • Hero Member
  • *****
  • Posts: 581
on: Jul 29, 2018
A person having a near point of 25 cm and a far point at infinity uses a converging lens of focal length 5.0 cm as a magnifying glass. What is the magnification if the person's eye is relaxed (with the image at his far point)?
 
  What will be an ideal response?

Question 2

What is the focal length of the corrective contact lens needed by a nearsighted person whose far point is 60 cm?
 
  A) -60 cm
  B) -30 cm
  C) +30 cm
  D) +60 cm
  E) +130 cm

Question 3

A person can read the newspaper when it is held at 60 cm from his eyes. What should the focal length of his contact lenses be to allow him to read the newspaper comfortably at a distance of 30 cm?
 
  A) -30 cm
  B) 30 cm
  C) -60 cm
  D) 60 cm
  E) 90 cm


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

Beatricemm

  • Sr. Member
  • ****
  • Posts: 323
Reply #1 on: Jul 29, 2018
Answer to Question 1

5.0 x

Answer to Question 2

You just saved me a lot of time. ;)

Answer to Question 3

Here to give you a feedback, your answer was right Awesome


berenicecastro

  • Member
  • Posts: 581
Reply 2 on: Jul 29, 2018
Thanks for the timely response, appreciate it

phuda

  • Member
  • Posts: 348
Reply 3 on: Yesterday
:D TYSM

« previous next »
 

Did you know?

In the United States, congenital cytomegalovirus causes one child to become disabled almost every hour. CMV is the leading preventable viral cause of development disability in newborns. These disabilities include hearing or vision loss, and cerebral palsy.

Did you know?

Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.

Did you know?

People about to have surgery must tell their health care providers about all supplements they take.

Did you know?

According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.

Did you know?

The use of salicylates dates back 2,500 years to Hippocrates's recommendation of willow bark (from which a salicylate is derived) as an aid to the pains of childbirth. However, overdosage of salicylates can harm body fluids, electrolytes, the CNS, the GI tract, the ears, the lungs, the blood, the liver, and the kidneys and cause coma or death.

Photograph of a person with a cataract in the right eye. Photograph of a person with a cataract in the right eye.
POWER POINT PRESENTATION logo POWER POINT PRESENTATION logo
Use of a hand tool to apply pressure to a trigger point. Use of a hand tool to apply pressure to a trigger point.
. Calculate the net electric field at point B . Calculate the net electric field at point B
Let A ⊆ R and p ∈ A. Suppose A\{p}6= ∅. Prove that p is an isolated point of A if and ... Let A ⊆ R and p ∈ A. Suppose A\{p}6= ∅. Prove that p is an isolated point of A if and ...
Find an equation of the tangent line to the graph of f(x) = sqrt(x) / (x+1) at the point x=1 Find an equation of the tangent line to the graph of f(x) = sqrt(x) / (x+1) at the point x=1
Video: Knee Animation

For a complete list of videos, visit our video library