GEOMETRICAL OPTICS
\d͡ʒˌiːə͡ʊmˈɛtɹɪkə͡l ˈɒptɪks], \dʒˌiːəʊmˈɛtɹɪkəl ˈɒptɪks], \dʒ_ˌiː__əʊ_m_ˈɛ_t_ɹ_ɪ_k_əl ˈɒ_p_t_ɪ_k_s]\
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"