The Pressure of Light
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In our eReader you can find the full English version of the book. Read The Pressure of Light Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book The Pressure of Light
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Theory shows that in a vacuum the momentum per length V of a beam, where V is the velocity of light, is equal to the energy per length i . This is fully confirmed by experiment, which shows also that it holds in gases at quite appreciable pressures.
Let us assume that it holds, too, in a solid medium, such as glass. Then we can prove as follows that the FIG. 37- force at the point of refraction is a pull outwards on the refracting medium.
Let us consider separately the reflected and refracted p...arts of a beam incident obliquely on a refracting medium. Let AB (fig. 37) be reflected along BC. Let AB represent the momentum per second brought to B by the part of the incident beam which is reflected. Then BC equal to AB will represent that in the reflected beam. Produce AB to D, making BD equal to AB or BC NOTES 8 9 Then momentum represented in magnitude and direc- tion by DC must be added to AB to convert it to BC, though it acts through B.
Then a force, CD, acts through B on the beam, and an equal and opposite force, DC, acts on the medium at B, that is, we have a normal pressure inwards.
What to read after The Pressure of Light?
You can find similar books in the "Read Also" column, or choose other free books by J H John Henry Poynting to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Theory shows that in a vacuum the momentum per length V of a beam, where V is the velocity of light, is equal to the energy per length i . This is fully confirmed by experiment, which shows also that it holds in gases at quite appreciable pressures.
Let us assume that it holds, too, in a solid medium, such as glass. Then we can prove as follows that the FIG. 37- force at the point of refraction is a pull outwards on the refracting medium.
Let us consider separately the reflected and refracted p...arts of a beam incident obliquely on a refracting medium. Let AB (fig. 37) be reflected along BC. Let AB represent the momentum per second brought to B by the part of the incident beam which is reflected. Then BC equal to AB will represent that in the reflected beam. Produce AB to D, making BD equal to AB or BC NOTES 8 9 Then momentum represented in magnitude and direc- tion by DC must be added to AB to convert it to BC, though it acts through B.
Then a force, CD, acts through B on the beam, and an equal and opposite force, DC, acts on the medium at B, that is, we have a normal pressure inwards.
What to read after The Pressure of Light?
You can find similar books in the "Read Also" column, or choose other free books by J H John Henry Poynting to read onlineMoreLess
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