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The beam emerging from a 1.5 W argon laser (? = 515 nm) has a diameter d of 3.0 mm. The beam is focused by a lens system with an effective focal length fL of 2.5 mm. The focused beam strikes a totally...

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The beam emerging from a 1.5 W argon laser (? = 515 nm) has a diameter d of 3.0 mm. The beam is focused by a lens system with an effective focal length fL of 2.5 mm. The focused beam strikes a totally absorbing screen, where it forms a circular diffraction pattern whose central disk has a radius R given by 1 .22 fL ?/d. It can be shown that 84% of the incident energy ends up within this central disk. At what rate are photons absorbed by the screen in the central disk of the diffraction pattern?
Answered Same Day Dec 24, 2021

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Robert answered on Dec 24 2021
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