passive otpical omponent
被动光学元件

• straight ball-guide
• straight channel multiplier
• straight edge
• straightening
• straight eyepiece
• straight gear
• straight guide
• straight lamp
• straight line
• straightness
• straightness of line of sight
• straight reciprocating motion
• straight roller bearing
• straight scale
• straight slit
• straight-teeth bevel gear
• straight-teeth gear
• straight-tube telescope
• straight up-and-down filament
• strain
• strainer
• strain-free objective
• strain-ga(u)ge
• strainmeter
• strain-optical coefficient