The angle of incidence beyond which rays of light passing through a denser medium to the surface of a less dense medium are no longer refracted but totally reflected.
〔光学〕临界角
Example sentencesExamples
To minimize fluorescence from the sample and meet the total external reflection condition, the system features a slit that restricts beam divergence in the scattering plane to less than the critical angle for substrate reflectance.
For angles exceeding the critical angle, the refracted waves are evanescent and the reflectivity is very close to unity.
The critical angle c below which x-rays can be efficiently scattered from smooth surfaces is quite small, hence the term grazing incidence.
Compared with the intensity enhancement for total internal reflection (~ 4 times that of the incident light) at the critical angle, the enhancement for SPR can reach up to 20-30 times higher.
If the beam through m1 is greater than the critical angle, then the refracted beam will be reflected entirely back into m1 (total internal reflection), even though m2 may be transparent!
Definition of critical angle in US English:
critical angle
noun
Optics
The angle of incidence beyond which rays of light passing through a denser medium to the surface of a less dense medium are no longer refracted but totally reflected.
〔光学〕临界角
Example sentencesExamples
For angles exceeding the critical angle, the refracted waves are evanescent and the reflectivity is very close to unity.
To minimize fluorescence from the sample and meet the total external reflection condition, the system features a slit that restricts beam divergence in the scattering plane to less than the critical angle for substrate reflectance.
Compared with the intensity enhancement for total internal reflection (~ 4 times that of the incident light) at the critical angle, the enhancement for SPR can reach up to 20-30 times higher.
If the beam through m1 is greater than the critical angle, then the refracted beam will be reflected entirely back into m1 (total internal reflection), even though m2 may be transparent!
The critical angle c below which x-rays can be efficiently scattered from smooth surfaces is quite small, hence the term grazing incidence.