FRESNEL LENS
\fɹˈɛsnə͡l lˈɛnz], \fɹˈɛsnəl lˈɛnz], \f_ɹ_ˈɛ_s_n_əl l_ˈɛ_n_z]\
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lens composed of a number of small lenses arranged to make a lightweight lens of large diameter and short focal length
By Princeton University
Word of the day
dust storm
- a windstorm that lifts up clouds of dust or sand a windstorm that lifts up clouds dust or sand; "it was the kind of duster not experienced in years"