angle of half intensity

half-intensity light angle

the angle width at half maximum intensity

acceptance half-angle

acceptance halfangle

beam half-angle

contact half angle

Convergence half angle

Convergent half angle

Divergent half angle

entry natural converging half angle

expansion cone half angle

formulae for half-angle

half angle

half angle formula

half angle formulas

half intensity width

half-angle

half-angle of mould