Quiz — Examen d'Optique géométrique session de rattrapage 2016.pdf

Question 1 sur 10 20:00

[{"id":29350,"question":"Quel type de lentille est utilisé dans une loupe ?","option_a":"Lentille divergente","option_b":"Lentille convergente","option_c":"Miroir plan","option_d":"Prisme","option_e":"","option_f":"","bonne_reponse":"b","explication":"Une loupe utilise une lentille convergente car elle permet d'obtenir une image agrandie et virtuelle d'un objet placé entre le foyer et la lentille.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Lentille divergente\", \"b\": \"Lentille convergente\", \"c\": \"Miroir p","_debug_options_count":4},{"id":29351,"question":"La loi de Snell-Descartes s'applique uniquement à la réflexion de la lumière.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"Faux. La loi de Snell-Descartes s'applique à la fois à la réflexion et à la réfraction de la lumière, en reliant les angles d'incidence et de réfraction aux indices de réfraction des milieux.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":29352,"question":"Quel est le grandissement d'une lentille si l'objet est placé à 20 cm de la lentille et l'image à 40 cm ?","option_a":"0,5","option_b":"1","option_c":"2","option_d":"4","option_e":"","option_f":"","bonne_reponse":"c","explication":"Le grandissement γ est donné par γ = OA'\/OA. Ici, γ = 40\/20 = 2. Cela signifie que l'image est deux fois plus grande que l'objet.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"0,5\", \"b\": \"1\", \"c\": \"2\", \"d\": \"4\"}}","_debug_options_count":4},{"id":29353,"question":"Un miroir convexe peut-il former une image réelle ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"Faux. Un miroir convexe ne peut former que des images virtuelles, droites et plus petites que l'objet.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":29354,"question":"Quelle est la distance focale d'une lentille de vergence +2 δ ?","option_a":"0,5 cm","option_b":"2 cm","option_c":"50 cm","option_d":"200 cm","option_e":"","option_f":"","bonne_reponse":"a","explication":"La vergence V est l'inverse de la distance focale f : V = 1\/f. Donc f = 1\/V = 1\/2 = 0,5 m = 50 cm.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"0,5 cm\", \"b\": \"2 cm\", \"c\": \"50 cm\", \"d\": \"200 cm\"}}","_debug_options_count":4},{"id":29355,"question":"Les rayons lumineux passant par le centre optique d'une lentille ne sont pas déviés.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Vrai. Le centre optique d'une lentille est le point où les rayons lumineux passent sans être déviés.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":29356,"question":"Quel est l'indice de réfraction de l'air par rapport au vide ?","option_a":"1,00","option_b":"1,33","option_c":"1,52","option_d":"1,66","option_e":"","option_f":"","bonne_reponse":"a","explication":"L'indice de réfraction de l'air est très proche de celui du vide, soit environ 1,00.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"1,00\", \"b\": \"1,33\", \"c\": \"1,52\", \"d\": \"1,66\"}}","_debug_options_count":4},{"id":29357,"question":"Un miroir concave peut-il former une image virtuelle ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Vrai. Un miroir concave peut former une image virtuelle si l'objet est placé entre le foyer et le sommet du miroir.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":29358,"question":"Quelle est la relation entre la vergence V et la distance focale f d'une lentille ?","option_a":"V = f","option_b":"V = 1\/f","option_c":"V = f²","option_d":"V = 2f","option_e":"","option_f":"","bonne_reponse":"b","explication":"La vergence V d'une lentille est définie comme l'inverse de sa distance focale f : V = 1\/f.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"V = f\", \"b\": \"V = 1\/f\", \"c\": \"V = f²\", \"d\": \"V = 2f\"}}","_debug_options_count":4},{"id":29359,"question":"Un rayon lumineux passant par le foyer objet d'une lentille convergente émerge parallèle à l'axe optique.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Vrai. C'est une propriété fondamentale des lentilles convergentes : un rayon passant par le foyer objet émerge parallèle à l'axe optique.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4}]