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Cataracts and Intraocular LensesA cataract is an opacity or "cloudiness" that develops in the lensof an eye. The result can be serious degradation of vision, or evenblindness. Cataracts can be caused by prolonged exposure to electromagnetic radiation of almost any form. For example, cataractsare unusually common among airline pilots, who encounter intense UV exposure at high altitude. To delay cataract formation,doctors recommend protecting the eyes from sunlight with sun-glasses or a hat with a brim.Cataracts are generally treated by removing the affected lens witha technique referred to as phacoemulsification. After the natural lensis removed, it is replaced with a man-made, intraocular lens, or IOL.In many cases, the IOL is rigid; neither its focal length nor locationcan be changed. In most cases these lenses are designed to allow theeye to see clearly at infinity, but corrective glasses or contacts must beworn for close vision. In extreme cases, a "piggyback" IOL may needto be installed along with the original IOL to fine-tune the optics.More recently, adaptive IOLs have been developed that flexwhen the focusing muscles of the eye contract, thus allowing a degree of accommodation. This is illustrated in FlisuRE $27-34,$ where we see the IOL move forward to focus on a close object. Notice that the focal length of the adaptive IOL is fixed, just as with a normalIOL, but the eye muscles can change its location- the same as in acamera when it focuses.Suppose a flexible, adaptive IOL has a focal length of 3.00 $\mathrm{cm}$ .How far forward must the IOL move to change the focus of the eyefrom an object at infinity to an object at a distance of 50.0 $\mathrm{cm} ?$$$\begin{array}{ll}{\text { A. } 1.9 \mathrm{mm}} & {\text { B. } 2.8 \mathrm{mm}} \\ {\text { C. } 3.1 \mathrm{mm}} & {\text { D. } 3.2 \mathrm{mm}}\end{array}$$

1.9 $\mathrm{mm}$

Physics 103

Chapter 27

Optical lnstruments

Wave Optics

Simon Fraser University

Hope College

McMaster University

Lectures

02:51

In physics, wave optics is…

10:02

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03:18

A cataract - impaired lens…

00:43

It has become common to r…

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In one form of cataract su…

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\cdots In one form of cata…

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Cataracts, the medical con…

04:15

$\bullet$$\bullet$ Resolut…

Okay, So in this question, we still have, uh I Oh, well, and this is a kind of tricky question, because we have I. Well, let's see the problem with a focal lens focal lens off three centimeters. And we want to know how far forward must I will move to change the focus off the I from object at infinity. So we have a position of the object about infinity and changed this position to a position of the object at 50. Think team enters. So again we have I or Ellen's with a focal length off precinct emitters. And we need to We want to discover how much this irony to change his position so he can change the focus to the infinity toe object. A 50 cent emitters are way, so let's see. First of all, let's calculate the distance of the image at the infinity. So at the infinity, we have Phelan's equation from the image. It's just going to be one, actually, that's what is a question here. We know the equation we need to use to calculate it is just going to be one divided by F minus one, divided by D zero Oh, to the power of minus one. So if we calculated this to the infinitive, that is the first case we have this first distance. It goes to one divided by three minus one, divided by infinity. Oh, to the power off minus one. So this is just three. Same team enters because this goes to zero. Okay, so now let's calculate it. When the when the focus is off, when the object is ar 15 centimeters on the lens. So we have one divided by three miners, one divided by 50. All these to the power off miners. One. This is going to be able to three point 19. State team enters. So the difference between this two let's call the Delta. The difference is just going to be 3.19 minus tree that's needs to be equals two 0.19. Same team enters and that's the answer, That's all. Thanks for watching

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In physics, wave optics is the study of the behavior of light, or other elec…

Interference is a phenomenon in which two waves superpose to form a resultan…

Cataracts and Intraocular LensesA cataract is an opacity or "cloudi…

Predict/Explain Treating Cataracts When the lens in a person's eye beco…

A cataract - impaired lens in an eye may be surgically removed and replaced …

It has become common to replace the cataract-clouded lens of the eye with a…

In one form of cataract surgery the person's natural lens, which has be…

\cdots In one form of cataract surgery the person's natural lens, which…

Cataracts, the medical condition where the lens of the eye becomes cloudy, a…

$\bullet$$\bullet$ Resolution of the eye, II. The maximum resolution of the<…

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B1O Radioactive Tracer The isotope $_{43}^{95} \mathrm{Tc}$ has a half-life …

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A rocket with a mass of $2.7 \times 10^{6} \mathrm{kg}$ has a relativistic k…

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An excited state of a particular atom has a mean lifetime of$0.60 \times…

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The following nuclei are observed to decay by emitting an $\alpha$ particle:…

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In the Compton effect, an X-ray photon scatters from a free electron. Find t…

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Predict/Calculate Sodium light, with a wavelength of$\lambda=589 \mathrm…

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CE Predict/Explain An uncharged capacitor is charged by moving some electron…

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Predict/Calculate Consider a baseball with a rest mass of 0.145 $\mathrm{kg}…

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The number 2 is also the smallest & first prime number (since every other even number is divisible by two).

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