A diffraction grating of diameter 1cm and 400 lines/mm is illuminated by white light at normal incidence. The diffracted light from second order is then focused by a camera lens of focal length f onto an electronic image detector, with the lens and detector aligned to the diffracted light at Ao = 550 nm. If the detector width is 2 cm, calculate the maximum value of f so that the whole wavelength region 400 nm to 700 nm is observed on the detector. Also, calculate the maximum detector pixel size in order that two wavelengths near 550 nm and separated by the minimum resolvable Sλ are separated by at least 2 pixels on the detector.

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Chapter27: Wave Optics
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A diffraction grating of diameter 1cm and 400 lines/mm is illuminated by white light at normal
incidence. The diffracted light from second order is then focused by a camera lens of
focal length f onto an electronic image detector, with the lens and detector aligned to the
diffracted light at Ao = 550 nm.
If the detector width is 2 cm, calculate the maximum value of f so that the whole wavelength
region 400 nm to 700 nm is observed on the detector.
Also, calculate the maximum detector pixel size in order that two wavelengths near 550
nm and separated by the minimum resolvable Sλ are separated by at least 2 pixels on the
detector.
Transcribed Image Text:A diffraction grating of diameter 1cm and 400 lines/mm is illuminated by white light at normal incidence. The diffracted light from second order is then focused by a camera lens of focal length f onto an electronic image detector, with the lens and detector aligned to the diffracted light at Ao = 550 nm. If the detector width is 2 cm, calculate the maximum value of f so that the whole wavelength region 400 nm to 700 nm is observed on the detector. Also, calculate the maximum detector pixel size in order that two wavelengths near 550 nm and separated by the minimum resolvable Sλ are separated by at least 2 pixels on the detector.
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