電でん子し光こう学がく

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Meanings

1

noun

electron optics

Technical field dealing with the behavior and control of electron beams, analogous to light optics.

電electricity

子child, sign of the rat, 11PM-1AM

光ray, light

学study, learning, science

光こう学がく
光学 is general optics (light), while 電子光学 specifically deals with electron beams.
電でん子し顕けん微び鏡きょう
電子顕微鏡 is an electron microscope, a device that relies on electron optics.

Compound of 電子 (electron) and 光学 (optics), a direct calque of the English term 'electron optics'.