{"common":{"save":0,"post_id":"8222","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"9296","post_id":"8222","mon_id":"1159533","chapter_id":"1159595","question":"<p>Tiêu c\u1ef1 c\u1ee7a th\u1ea5u kính h\u1ed9i t\u1ee5 là gì?<\/p>","options":["A. Kho\u1ea3ng cách t\u1eeb v\u1eadt \u0111\u1ebfn màn h\u1ee9ng \u1ea3nh.","B. Kho\u1ea3ng cách t\u1eeb v\u1eadt \u0111\u1ebfn th\u1ea5u kính.","C. Kho\u1ea3ng cách t\u1eeb quang tâm \u0111\u1ebfn tiêu \u0111i\u1ec3m.","D. Kho\u1ea3ng cách t\u1eeb tiêu \u0111i\u1ec3m này \u0111\u1ebfn tiêu \u0111i\u1ec3m kia."],"correct":"3","level":"1","hint":"","answer":"<p>\u0110áp án: C. Kho\u1ea3ng cách t\u1eeb quang tâm \u0111\u1ebfn tiêu \u0111i\u1ec3m.<br \/>Gi\u1ea3i thích:<br \/>Tiêu c\u1ef1 là kho\u1ea3ng cách t\u1eeb quang tâm c\u1ee7a th\u1ea5u kính \u0111\u1ebfn tiêu \u0111i\u1ec3m, n\u01a1i mà các tia sáng song song v\u1edbi tr\u1ee5c chính h\u1ed9i t\u1ee5 sau khi \u0111i qua th\u1ea5u kính.<br \/> <\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"125","test":"0","date":"2024-12-24 16:28:18","option_type":"txt","len":3},{"id":"9297","post_id":"8222","mon_id":"1159533","chapter_id":"1159595","question":"<p>Trong thí nghi\u1ec7m \u0111o tiêu c\u1ef1 c\u1ee7a th\u1ea5u kính h\u1ed9i t\u1ee5, thi\u1ebft b\u1ecb nào sau \u0111ây không c\u1ea7n s\u1eed d\u1ee5ng?<\/p>","options":["A. Th\u1ea5u kính h\u1ed9i t\u1ee5.<br \/>\n ","B. Ngu\u1ed3n sáng.","C. B\u1ea3ng chia \u0111\u1ed9.<br \/>\n ","D. \u0110i\u1ec7n k\u1ebf."],"correct":"4","level":"1","hint":"","answer":"<p>\u0110áp án: D. \u0110i\u1ec7n k\u1ebf.<br \/>Gi\u1ea3i thích:<br \/>\u0110i\u1ec7n k\u1ebf là thi\u1ebft b\u1ecb \u0111o dòng \u0111i\u1ec7n, không liên quan \u0111\u1ebfn thí nghi\u1ec7m \u0111o tiêu c\u1ef1. Các thi\u1ebft b\u1ecb c\u1ea7n thi\u1ebft là th\u1ea5u kính, ngu\u1ed3n sáng và b\u1ea3ng chia \u0111\u1ed9.<br \/> <\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"125","test":"0","date":"2024-12-24 16:29:43","option_type":"txt","len":2},{"id":"9298","post_id":"8222","mon_id":"1159533","chapter_id":"1159595","question":"<p>Trong thí nghi\u1ec7m \u0111o tiêu c\u1ef1 c\u1ee7a th\u1ea5u kính h\u1ed9i t\u1ee5, v\u1eadt c\u1ea7n \u0111\u1eb7t \u1edf \u0111âu \u0111\u1ec3 thu \u0111\u01b0\u1ee3c \u1ea3nh th\u1eadt rõ nét trên màn?<\/p>","options":["A. \u1ede tiêu \u0111i\u1ec3m c\u1ee7a th\u1ea5u kính.","B. \u1ede xa th\u1ea5u kính h\u01a1n tiêu \u0111i\u1ec3m.","C. \u1ede g\u1ea7n th\u1ea5u kính h\u01a1n tiêu \u0111i\u1ec3m.","D. \u1ede ngay quang tâm c\u1ee7a th\u1ea5u kính."],"correct":"2","level":"1","hint":"","answer":"<p>\u0110áp án: B. \u1ede xa th\u1ea5u kính h\u01a1n tiêu \u0111i\u1ec3m.<br \/>Gi\u1ea3i thích:<br \/>V\u1eadt ph\u1ea3i \u0111\u1eb7t xa h\u01a1n tiêu \u0111i\u1ec3m \u0111\u1ec3 th\u1ea5u kính h\u1ed9i t\u1ee5 t\u1ea1o ra \u1ea3nh th\u1eadt, rõ nét trên màn.<br \/> <\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"125","test":"0","date":"2024-12-24 16:31:46","option_type":"txt","len":2}]}