This topic contains a solution. Click here to go to the answer

Author Question: A person having a near point of 25 cm and a far point at infinity uses a converging lens of focal ... (Read 146 times)

berenicecastro

  • Hero Member
  • *****
  • Posts: 581
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
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
Great answer, keep it coming :)


AmberC1996

  • Member
  • Posts: 317
Reply 3 on: Yesterday
:D TYSM

 

Did you know?

As many as 20% of Americans have been infected by the fungus known as Histoplasmosis. While most people are asymptomatic or only have slight symptoms, infection can progress to a rapid and potentially fatal superinfection.

Did you know?

Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.

Did you know?

Tobacco depletes the body of vitamins A, C, and E, which can result in any of the following: dry hair, dry skin, dry eyes, poor growth, night blindness, abscesses, insomnia, fatigue, reproductive system problems, sinusitis, pneumonia, frequent respiratory problems, skin disorders, weight loss, rickets, osteomalacia, nervousness, muscle spasms, leg cramps, extremity numbness, bone malformations, decayed teeth, difficulty in walking, irritability, restlessness, profuse sweating, increased uric acid (gout), joint damage, damaged red blood cells, destruction of nerves, infertility, miscarriage, and many types of cancer.

Did you know?

The most common treatment options for addiction include psychotherapy, support groups, and individual counseling.

Did you know?

Always store hazardous household chemicals in their original containers out of reach of children. These include bleach, paint, strippers and products containing turpentine, garden chemicals, oven cleaners, fondue fuels, nail polish, and nail polish remover.

For a complete list of videos, visit our video library