Рассчитать увеличение школьного телескопа рефрактора который имеет диаметр 80 мм и фокусное расстояние 80 см при окулярах с фокусным расстоянием 28 мм, 20 мм и 10 мм Умоляю я не шарю в астрономии вообще
Marina Tsvetaeva was a Russian and Soviet poet. She was born on the 8th of October in Moscow. She was daughter of Ivan Vladimirovich Tsvetaev,a professor of Fine Art at the Universityof Moscow. Tsvetaeva's mother Maria Alexandrovna Meyn, Ivan's second wife was a concert pianist. Marina started to write poems at 6 years not only Russian but also French and German. In 1902 Tsvetaeva's mother contracted tuberculuse. In 1906 Tsvetaeva's mother died. In 12 years old Tsvetaeva was sent to school in Lausanne. She gave up the strict musical studies that her mother had imposed and turned to poetry. She wrote "with a mother like her I had only one choice:to mecome a poet." At Koktebel Tsvetaeva met Sergei Yakovlevich Efron, a 17 year old cadet in the Officer's Academy. She was 19, he was 18 they fell in love and get married. In 1922 Tsvetaeva with her daughter Arianda went abroad to her husband who was studying at the University of Prague. There they lived 3 years and in 1925 they went to Paris. In 1939 she returned to USSR. Her husband Sergei Efron and her daughter Arianda were arristed and her husband was executed. Tsvetaeva earned living poetic translations. At the begining of war she was evacuted with her son in Elabuge. Lonely and unemployed poet in 1941 commiteted suicide. Tsvetaeva is a tragic poey. She ramained in the history of Russian literature"lonely spirit". The theme of her poetry collections is "Milestones" "Craft" "After Russia" "Poem of the Mountain" "poem of the end" and others.
