optics (n.)
- acoustics
- actinometry
- astrophysics
- biophysics
- catoptrics
- cryogenics
- crystallography
- electronics
- geophysics
- mechanics
- microscopy
- optometry
- philosophy
- photography
- photometry
- physic
- physics
- psychophysics
- spectrometry
- spectroscopy
- statics
- stereoscopy
- telescopy
- thermodynamics
But optics sharp it needs, I ween,
To see what is not to be seen.
As men of inward light are wont
To turn their optics in upon 't.
