{"common":{"save":0,"post_id":"8230","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"9312","post_id":"8230","mon_id":"1159533","chapter_id":"1159595","question":"<p>Kính lúp là gì?<\/p>","options":["A. M\u1ed9t lo\u1ea1i kính dùng \u0111\u1ec3 nhìn xa.","B. M\u1ed9t lo\u1ea1i kính dùng \u0111\u1ec3 phóng \u0111\u1ea1i \u1ea3nh c\u1ee7a v\u1eadt nh\u1ecf.","C. M\u1ed9t lo\u1ea1i kính ph\u1eb3ng \u0111\u1ec3 b\u1ea3o v\u1ec7 m\u1eaft.","D. M\u1ed9t lo\u1ea1i kính dùng \u0111\u1ec3 t\u1ea1o ra \u1ea3nh th\u1eadt l\u1edbn h\u01a1n v\u1eadt."],"correct":"2","level":"1","hint":"","answer":"<p>\u0110áp án: B. M\u1ed9t lo\u1ea1i kính dùng \u0111\u1ec3 phóng \u0111\u1ea1i \u1ea3nh c\u1ee7a v\u1eadt nh\u1ecf.<br \/>Gi\u1ea3i thích:<br \/>Kính lúp là m\u1ed9t th\u1ea5u kính h\u1ed9i t\u1ee5 có tiêu c\u1ef1 nh\u1ecf, \u0111\u01b0\u1ee3c dùng \u0111\u1ec3 phóng \u0111\u1ea1i \u1ea3nh c\u1ee7a v\u1eadt nh\u1ecf khi quan sát.<br \/> <\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"125","test":"0","date":"2024-12-24 23:13:33","option_type":"txt","len":3},{"id":"9313","post_id":"8230","mon_id":"1159533","chapter_id":"1159595","question":"<p>\u1ea2nh t\u1ea1o b\u1edfi kính lúp khi v\u1eadt \u0111\u1eb7t trong kho\u1ea3ng tiêu c\u1ef1 là:<\/p>","options":["A. \u1ea2nh th\u1eadt, ng\u01b0\u1ee3c chi\u1ec1u, l\u1edbn h\u01a1n v\u1eadt.","B. \u1ea2nh \u1ea3o, cùng chi\u1ec1u, l\u1edbn h\u01a1n v\u1eadt.","C. \u1ea2nh th\u1eadt, cùng chi\u1ec1u, nh\u1ecf h\u01a1n v\u1eadt.","D. \u1ea2nh \u1ea3o, ng\u01b0\u1ee3c chi\u1ec1u, nh\u1ecf h\u01a1n v\u1eadt."],"correct":"2","level":"1","hint":"","answer":"<p>\u0110áp án: B. \u1ea2nh \u1ea3o, cùng chi\u1ec1u, l\u1edbn h\u01a1n v\u1eadt.<br \/>Gi\u1ea3i thích:<br \/>Khi v\u1eadt n\u1eb1m trong kho\u1ea3ng tiêu c\u1ef1 c\u1ee7a kính lúp, \u1ea3nh t\u1ea1o ra s\u1ebd là \u1ea3nh \u1ea3o, l\u1edbn h\u01a1n v\u1eadt, và cùng chi\u1ec1u v\u1edbi v\u1eadt.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"125","test":"0","date":"2024-12-24 23:14:55","option_type":"txt","len":2},{"id":"9314","post_id":"8230","mon_id":"1159533","chapter_id":"1159595","question":"<p>\u0110\u1ed9 b\u1ed9i giác c\u1ee7a kính lúp \u0111\u01b0\u1ee3c xác \u0111\u1ecbnh b\u1edfi:<\/p>","options":["A. Chi\u1ec1u cao c\u1ee7a v\u1eadt và chi\u1ec1u cao c\u1ee7a \u1ea3nh.","B. Tiêu c\u1ef1 c\u1ee7a kính và kho\u1ea3ng nhìn rõ ng\u1eafn nh\u1ea5t.","C. Kho\u1ea3ng cách t\u1eeb v\u1eadt \u0111\u1ebfn kính.","D. Kho\u1ea3ng cách t\u1eeb v\u1eadt \u0111\u1ebfn tiêu \u0111i\u1ec3m c\u1ee7a kính."],"correct":"2","level":"1","hint":"","answer":"<p>\u0110áp án: B. Tiêu c\u1ef1 c\u1ee7a kính và kho\u1ea3ng nhìn rõ ng\u1eafn nh\u1ea5t.<br \/>Gi\u1ea3i thích:<br \/>\u0110\u1ed9 b\u1ed9i giác <span class=\"math-tex\">$G$<\/span> c\u1ee7a kính lúp \u0111\u01b0\u1ee3c xác \u0111\u1ecbnh b\u1edfi công th\u1ee9c: <span class=\"math-tex\">$G = {d \\over f}$<\/span><br \/>v\u1edbi ???? là kho\u1ea3ng nhìn rõ ng\u1eafn nh\u1ea5t và <span class=\"math-tex\">$f$<\/span> là tiêu c\u1ef1 c\u1ee7a kính.<br \/> <\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"125","test":"0","date":"2024-12-24 23:17:41","option_type":"txt","len":3}]}
