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Force of Electromagnetic Radiation and Visible Light

  1. Nov 10, 2012 #1
    Is there an equation for force due to electromagnetic radiation?

    For example, is there a force due to orange light?
  2. jcsd
  3. Nov 10, 2012 #2

    Simon Bridge

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    welcome to PF;
    yes: F=dp/dt

    Photons carry momentum so you can use conservation of momentum and the brightness of the light to figure the force. Generally, light illuminates an area so you will be working out force per unit area.
    - look up "light pressure"
  4. Nov 12, 2012 #3

    Andy Resnick

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    Light can also carry angular momentum; additionally, linearly polarized light can exert a torque on a birefringent material.
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