Thursday 4 October 2018

optics - Focusing light into an optical fiber cable


I'm trying to focus light from a flashing light lamp throught two lens into a optical fiber cable which is around 0.8cm in diameter.



  • flashing light: a bulb and then covered by a glass of 7.5cm x 7cm

  • Fresnel Lens 310 x 310mm, Thickness: 2mm, Focal length: 220mm


I tried to use a piece of white paper to focus the image, however, my teacher said that the focal point might have more intense light. But focal point is not somewhere I can see. Is his theory right about focal point have more intense light than the image point?


I wonder if I could use more convex lens to focus the spot of light into a smaller diameter?




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