Phản xạ toàn phần

Home Lớp 9 Khoa học tự nhiên 9 - sách kết nối tri thức Bài 6: Phản xạ toàn phầnBài tập trung bình

{"common":{"save":0,"post_id":"8134","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"9084","post_id":"8134","mon_id":"1159533","chapter_id":"1159595","question":"M\u1ed9t tia sáng \u0111i t\u1eeb n\u01b0\u1edbc ($n_1 = 1,33$<\/span>) ra không khí ($n_2 = 1,00$<\/span>) v\u1edbi góc t\u1edbi 50°. Góc gi\u1edbi h\u1ea1n c\u1ee7a n\u01b0\u1edbc là 48,8$^o$<\/span>. Hi\u1ec7n t\u01b0\u1ee3ng nào x\u1ea3y ra?<\/p>","options":["A. Tia sáng b\u1ecb khúc x\u1ea1.","B. Tia sáng b\u1ecb ph\u1ea3n x\u1ea1 m\u1ed9t ph\u1ea7n và khúc x\u1ea1 m\u1ed9t ph\u1ea7n. \n ","C. Hi\u1ec7n t\u01b0\u1ee3ng ph\u1ea3n x\u1ea1 toàn ph\u1ea7n. \n ","D. Không có hi\u1ec7n t\u01b0\u1ee3ng gì."],"correct":"3","level":"2","hint":"","answer":"\u0110áp án: C<\/p>Gi\u1ea3i thích:<\/p>- Góc t\u1edbi h\u1ea1n $i_{th}\\ l\u00e0\\ 48,8^o$<\/span>.<\/p>- Vì 50° > 48,8°, hi\u1ec7n t\u01b0\u1ee3ng ph\u1ea3n x\u1ea1 toàn ph\u1ea7n x\u1ea3y ra. <\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"125","test":"0","date":"2024-12-07 17:25:36","option_type":"txt","len":3},{"id":"9085","post_id":"8134","mon_id":"1159533","chapter_id":"1159595","question":"M\u1ed9t tia sáng truy\u1ec1n t\u1eeb th\u1ee7y tinh ($n_1 = 1,5$<\/span>) sang không khí ($n_2 = 1,0$<\/span>). Bi\u1ebft góc t\u1edbi h\u1ea1n c\u1ee7a th\u1ee7y tinh là $41,8^o$<\/span>. N\u1ebfu góc t\u1edbi là $40^\\circ$<\/span>, hi\u1ec7n t\u01b0\u1ee3ng nào x\u1ea3y ra?<\/p>","options":["A. Ch\u1ec9 x\u1ea3y ra hi\u1ec7n t\u01b0\u1ee3ng khúc x\u1ea1.","B. Ch\u1ec9 x\u1ea3y ra hi\u1ec7n t\u01b0\u1ee3ng ph\u1ea3n x\u1ea1 toàn ph\u1ea7n. \n ","C. M\u1ed9t ph\u1ea7n ánh sáng b\u1ecb khúc x\u1ea1, m\u1ed9t ph\u1ea7n b\u1ecb ph\u1ea3n x\u1ea1.","D. Không có hi\u1ec7n t\u01b0\u1ee3ng gì."],"correct":"3","level":"2","hint":"","answer":"\u0110áp án: C<\/p>Gi\u1ea3i thích:<\/p>Góc t\u1edbi 40° < 41,8°, do \u0111ó tia sáng b\u1ecb khúc x\u1ea1 và ph\u1ea3n x\u1ea1 m\u1ed9t ph\u1ea7n.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"125","test":"0","date":"2024-12-07 17:29:00","option_type":"txt","len":3},{"id":"9086","post_id":"8134","mon_id":"1159533","chapter_id":"1159595","question":"M\u1ed9t tia sáng truy\u1ec1n t\u1eeb n\u01b0\u1edbc ($n_1 = 1,33$<\/span>) vào th\u1ee7y tinh ($n_2 = 1,5$<\/span>) v\u1edbi góc t\u1edbi 60°. Góc khúc x\u1ea1 s\u1ebd:<\/p>","options":["A. L\u1edbn h\u01a1n góc t\u1edbi.","B. Nh\u1ecf h\u01a1n góc t\u1edbi.","C. B\u1eb1ng góc t\u1edbi. \n ","D. Không xác \u0111\u1ecbnh. "],"correct":"2","level":"2","hint":"","answer":"\u0110áp án: B<\/p>Gi\u1ea3i thích:<\/p>Vì $n_2 > n_1$<\/span>, góc khúc x\u1ea1 nh\u1ecf h\u01a1n góc t\u1edbi khi ánh sáng truyên t\u1eeb môi tr\u01b0\u1eddng có chi\u1ebft su\u1ea5t th\u1ea5p sang môi tr\u01b0\u1eddng có chi\u1ebft su\u1ea5t cao.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"125","test":"0","date":"2024-12-07 17:32:19","option_type":"txt","len":2}]}