Оптическая сила линзы равна -1,6 дптр. Каково фокусное расстояние этой линзы? Можно ли с ее помощью получить действительное изображение?
СРОЧНО!!!!!!
За быстрый ответ не обижу)))) По

Answer the questions in the negative using words in brackets.

1 when did rain last?(since September)
2 when did you last eat caviar? (for ages)
3 when did you play chess last? (for a long time)
4 when did he last write to you? (since last summer)
5 when did you last go to Madrid? (never)
6 when did you last ride a horse? (for two months)
7 when did you last visit her& (since last month)
8 when did your boy-friend give you a present last? (since my birthday)
9 when did you buy fruits last? (for two days)
10 when did you speak to your German friend on the telephone last?(since New Year)