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$\cdot$ The eyepiece of a refracting astronomical telescope (see Figure 25.16 ) has a focal length of 9.00 $\mathrm{cm} .$ The distance between objective and eyepiece is $1.80 \mathrm{m},$ and the final image is at infinity. What is the angular magnification of the telescope?

$=[-19]$The negative sign indicates that the image is inverted.

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

Hope College

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.

02:01

The eyepiece of a refracti…

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An astronomical telescope …

02:24

The objective lens of an a…

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A telescope is constructed…

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because the image is formed at infinity, meaning that magnification is just negative. One over F, too. Where, where if one is the focal length of the eyepiece? Enough two is the focal length of the objective, and we also know that the some of F one enough, too, is the distance between the objective of the lens. There's 1.8 meters are 1 80 centimeters therefore and were given and were given that if two is 20.9 or lips nine centimeters on, so that's equal to 1 80 Therefore, ask one the focal length. Ah, of object come focal length of the um objective is 1.1 71 centimeters or 1.71 meters. Therefore, we have magnification annual magnification of 1 71 centimeters over nine centimeters, giving us negative 19

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