Force on a Lens

  • Thread starter andrewm
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Homework Statement


A laser of power P with wavelength [tex]\lambda[/tex] is directed through a lens (focal length f) off the optical axis by a distance d. What is the sideways force on the lens?


Homework Equations



Not sure. The average radiation pressure is I/c, where I is the intensity. But this does not seem useful.
 

Answers and Replies

  • #2
mgb_phys
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You can just think of this classicaly.
Imaging a stream of particles being deflect downward by a certain angle - just calculate the resulting force on the deflector.

The angle you get form the focal length - the number of particles (photons) from the intenisty and the momentum form the wavelength
 

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