photointerrupter
slitmask
Fresnel zone plate
optical prism
diascopic
projector
prism
optic
strapper
episcopic
diffraction grating
grating
collimator
sealed beam
borescope
lens
beam splitter
nanoprobe
autocollimator
Polaroid
lightguide
chromatoscanner
photophone
lense
laser
optical switch
etalon
biprism
polyrod
Wood's glass
coelostat
lens system
laser pointer
ring laser
Porro prism
Bragg mirror
goniophotometer
sunray
nuller
diffuser
microscope
diffusor
pair of binoculars
luminaire
periscope
Wollaston prism
jeweler's glass
light fixture
photocounter
binoculars
optics
light fitting
light-emitting diode
flasher
ring flash
boresight
beambreak
heliostat
polychromator
beamtrain
anaclastics
light-duty
abatjour
lamp
photochromism
two-way switch
convex lens
mirrorlike
headlamp
Maglite
kaleidoscope
optomagnonics
optically
headlight
specular
converging lens
television-camera tube
sparkling
repulsor beam
gunsight
photophore
opto-
snoot
television pickup tube
bifocals
optical device
field glasses
opera glasses
lampglass
speculum
luminoscope

English words for 'An optical device that acts as a switch when a beam of light is blocked by a foreign object'

As you may have noticed, above you will find words for "An optical device that acts as a switch when a beam of light is blocked by a foreign object". Hover the mouse over the word you'd like to know more about to view its definition. Click search related words by phrase or description. to find a better fitting word. Finally, thanks to ChatGPT, the overall results have been greatly improved.

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