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measurement unit specifying the refractive power of a lens by representing the reciprocal of its focal length in metres, one dioptre being equivalent to the refractive power of a lens with a focal length of one metre
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FÉACH FREISIN · SEE ALSO
# Doppler shift · aistriú Doppler#
FÉACH FREISIN · SEE ALSO
# Doppler effect · iarmhairt Doppler#
FÉACH FREISIN · SEE ALSO
# radiation spectrum · speictream radaíochta#
Natural Sciences & Mathematics » Astronomy » Satellites The look angle of the earth station in degrees above the horizon.