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$\bullet$$\bullet$ Radiation falling on a perfectly reflecting surface produces an average pressure $p .$ If radiation of the same intensity falls on a perfectly absorbing surface and is spread over twice the area, what is the pressure at that surface in terms of $p ?$

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$=\frac{p}{2}$

Physics 102 Electricity and Magnetism

Physics 103

Chapter 23

Electromagnetic Waves and Propagationof Light

Electromagnetic Waves

Reflection and Refraction of Light

Cornell University

Rutgers, The State University of New Jersey

University of Michigan - Ann Arbor

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.

01:31

Radiation falling on a per…

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A $180-\mathrm{W} / \mathr…

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Radiation of intensity $I$…

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Radiation PressureThe …

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$\bullet$ The intensity at…

01:44

The average intensity of t…

01:25

If the radiation energy fr…

02:35

What is the radiation pres…

03:31

$\because$ (a) If the lase…

and this problem. We have a totally reflecting surface, and its pressure is going to be twice the standard pressure for total absorbing surface. And the reason it's twice is because it's got send it back. And so the pressure is twice as much, and we're gonna let this pressure be denoted by key. We want to figure out what the pressure of this is in terms of P, and so we start with I oversee. This is thie pressure from a totally absorbing surface. And so let's multiply both sides and let's multiply the numerator and the denominator right, too. So I meant to say, And so I get to I over to see. And then now I'm going to bring this to in the denominator out front and then leave it to the numerator with the eye. It's a long doing. Is setting up a situation where this it's the same as that, and so I can plug in P for And so this is You got to pee or two and so a total absorbing surface will have half the pressure of a total reflecting surface. The area, and so that's the answer

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