« previous next »

Author Question: You are designing contact lenses for someone whose near point is 43 cm. What focal length lens ... (Read 77 times)

stevenposner

  • Hero Member
  • *****
  • Posts: 608
on: Jul 28, 2018
You are designing contact lenses for someone whose near point is 43 cm. What focal length lens should you prescribe so that an object can be clearly seen when placed at 25 cm in front of the eye?
 a. 43 cm
  c. -15 cm
  b. 18 cm
  d. 60 cm

Question 2

A lens with a focal length of 12 cm has what refractive power?
 a. 5.0 diopters
  c. 6.7 diopters
  b. 9.6 diopters
  d. 8.3 diopters


Anton

  • Sr. Member
  • ****
  • Posts: 302
Reply #1 on: Jul 28, 2018
Answer to Question 1

D

Answer to Question 2

D


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

As of mid-2016, 18.2 million people were receiving advanced retroviral therapy (ART) worldwide. This represents between 43–50% of the 34–39.8 million people living with HIV.

Did you know?

Though Candida and Aspergillus species are the most common fungal pathogens causing invasive fungal disease in the immunocompromised, infections due to previously uncommon hyaline and dematiaceous filamentous fungi are occurring more often today. Rare fungal infections, once accurately diagnosed, may require surgical debridement, immunotherapy, and newer antifungals used singly or in combination with older antifungals, on a case-by-case basis.

Did you know?

Nearly all drugs pass into human breast milk. How often a drug is taken influences the amount of drug that will pass into the milk. Medications taken 30 to 60 minutes before breastfeeding are likely to be at peak blood levels when the baby is nursing.

Did you know?

Although not all of the following muscle groups are commonly used, intramuscular injections may be given into the abdominals, biceps, calves, deltoids, gluteals, laterals, pectorals, quadriceps, trapezoids, and triceps.

Did you know?

Thyroid conditions may make getting pregnant impossible.

The vertebrate single-lens eye. The vertebrate single-lens eye.
One-point linear perspective. One-point linear perspective.
The Method for Determining the Two-Point Discrimination Threshold The Method for Determining the Two-Point Discrimination Threshold
. Calculate the net electric field at point B . Calculate the net electric field at point B
A three-point mapping cross in Drosophila melanogaster A three-point mapping cross in Drosophila melanogaster
Video: Summary of glucose catabolism

For a complete list of videos, visit our video library