Accommodation and Diopters Range for Bifocal Optics

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SUMMARY

The discussion focuses on calculating the near point and far point of a woman wearing bifocal lenses with powers of -1.2 D and 1.8 D. The far point is set at infinity, while the near point is at 25 cm. The power of accommodation is determined by the difference between the near and far points, which defines the range of diopters that can change. The relevant formula used is 1/f = 1/V + 1/B, which is essential for solving these optical problems.

PREREQUISITES
  • Understanding of optical lens formulas, specifically 1/f = 1/V + 1/B
  • Knowledge of diopters and their significance in lens power
  • Familiarity with the concept of accommodation in optics
  • Basic understanding of bifocal lens design and functionality
NEXT STEPS
  • Research the concept of power of accommodation in optics
  • Learn how to calculate near and far points using lens formulas
  • Explore the effects of different lens powers on vision
  • Study the design and application of bifocal lenses in vision correction
USEFUL FOR

Optometry students, optical engineers, and anyone interested in understanding the mechanics of bifocal lenses and vision correction techniques.

der.physika
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Homework Statement



A woman is wearing bifocals that have one-half of the lens with a power of -1.2 D and the other with a power of 1.8 D. A lens provides her with a far point set at infinity and other will give her a near point of 25 cm.

Where are her near point and far point WITHOUT her glasses?

What is her power of accomodation, what is therefore the range in which her Diopters can change?


Homework Equations



1/f = 1/V + 1/B

The Attempt at a Solution



do I just use the near point and far point equations for the first one?
 
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Yeah, this is basically just two problems in one. I do have to admit though, I don't know what power of accomodation is. I could maybe learn about it if you get stuck. Give it a try.
 

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