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$\cdot$ A person can see clearly up close, but cannot focus on objects beyond 75.0 $\mathrm{cm}$ . She opts for contact lenses to correct her vision. (a) Is she nearsighted or farsighted? (b) What typeof lens (converging or diverging) is needed? (b) What type vision? (c) What focal-length contact lens is needed, and what is its power in diopters?

a) nearsightedb) diverging lensc) $-1.33$ diopters

Physics 102 Electricity and Magnetism

Physics 103

Chapter 25

Optical Instruments

Electromagnetic Waves

Reflection and Refraction of Light

Rutgers, The State University of New Jersey

University of Washington

Simon Fraser University

McMaster University

Lectures

02:30

In optics, ray optics is a geometric optics method that uses ray tracing to model the propagation of light through an optical system. As in all geometric optics methods, the ray optics model assumes that light travels in straight lines and that the index of refraction of the optical material remains constant throughout the system.

10:00

In optics, reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated. Common examples include the reflection of light, sound and water waves. The law of reflection says that for specular reflection the angle at which the wave is incident on the surface equals the angle at which it is reflected. Reflection may also be referred to as "mirror image" or "specular reflection". Refraction is the change in direction of a wave due to a change in its speed. The refractive index of a material is a measure of its ability to change the direction of a wave. A material with a higher refractive index will change the direction of a wave to a greater degree than a material with a lower refractive index. When a wave crosses the boundary between two materials with different refractive indices, part of the wave is refracted; that is, it changes direction. The ratio of the speeds of propagation of the two waves determines the angle of refraction, which is the angle between the direction of the incident and the refractive rays.

04:12

A person can see clearly u…

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01:40

BIO A person can see clear…

01:35

A nearsighted person canno…

00:38

02:55

A nearsighted woman can’t …

all right. A person can see so thereby all checks. But now tor away objects. So common sense tells us that she is nearsighted on dso From the text, we know that two correct nearsighted vision. We need a diverging lens. So that's parts of those parts A and B on part C. The first note that ah, and the near point of virtual images created by by yeah, contact lens. And so that means that image distances negatives on then, for faraway objects that are far away, far enough away image just object distance goes to infinity and gets very large, meaning that one over s goes to zero. Therefore, whenever focal ink is equal to one of her vice prime, which is negative 75 centimeters, um, plus zero. And so f will be negative. 75 centimeters. So that's the diverging ones. And then power is one over f ine meters. So one of our negative 10.75 meters And so that's negative. 1.33 or 4/3 um, of a DI option

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