A small circular opening is used for imaging in a mobile phone (pinhole camera without a lens). The distance d from the opening to the detector is 8.2 mm. (i) Find the diameter of the opening that would give the highest resolution at 2= 0.5 µm. y' Circular detector opening d (ii) For this pinhole camera calculate the Fresnel number at the central point on the detector. (iii) Which of the two Fresnel or Fraunhofer diffraction approximation is more suitable when describing the field distribution on the detector?
A small circular opening is used for imaging in a mobile phone (pinhole camera without a lens). The distance d from the opening to the detector is 8.2 mm. (i) Find the diameter of the opening that would give the highest resolution at 2= 0.5 µm. y' Circular detector opening d (ii) For this pinhole camera calculate the Fresnel number at the central point on the detector. (iii) Which of the two Fresnel or Fraunhofer diffraction approximation is more suitable when describing the field distribution on the detector?
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Transcribed Image Text:A small circular opening is used for imaging in a mobile phone (pinhole camera without
a lens). The distance d from the opening to the detector is 8.2 mm.
(i) Find the diameter of the opening that would give the highest resolution at 1= 0.5 µm.
Circular
detector
opening
(ii) For this pinhole camera calculate the Fresnel number at the central point on the
detector.
(iii) Which of the two Fresnel or Fraunhofer diffraction approximation is more suitable
when describing the field distribution on the detector?
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