Quiz — h-perpa_Optique_1re_année_MPSI-PCSI-PTSI_-_édition_2003.pdf

Question 1 sur 10 20:00

[{"id":39330,"question":"Quel phénomène se produit lorsque la lumière passe d'un milieu à un autre avec un changement de direction ?","option_a":"Réflexion","option_b":"Réfraction","option_c":"Diffraction","option_d":"Dispersion","option_e":"","option_f":"","bonne_reponse":"b","explication":"La réfraction est le phénomène où la lumière change de direction en passant d'un milieu à un autre, comme expliqué par la loi de Snell-Descartes.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Réflexion\", \"b\": \"Réfraction\", \"c\": \"Diffraction\", \"d\": \"Disper","_debug_options_count":4},{"id":39331,"question":"Vrai ou Faux ? Une lentille convergente peut former une image virtuelle.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Une lentille convergente peut former une image virtuelle si l'objet est 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\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":39332,"question":"Quelle est la distance focale d'une lentille si son vergence est de +2 δ (dioptries) ?","option_a":"0,5 m","option_b":"2 m","option_c":"0,25 m","option_d":"5 m","option_e":"","option_f":"","bonne_reponse":"a","explication":"La vergence C est l'inverse de la distance focale f : C = 1\/f. Donc f = 1\/C = 1\/2 = 0,5 m.","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 m\", \"b\": \"2 m\", \"c\": \"0,25 m\", \"d\": \"5 m\"}}","_debug_options_count":4},{"id":39333,"question":"Vrai ou Faux ? Un miroir plan forme toujours une image virtuelle et symétrique par rapport au plan du miroir.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Un miroir plan forme une image virtuelle, droite et symétrique par rapport au plan 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":39334,"question":"Quel est le grandissement γ d'une lentille si l'objet est placé à 30 cm de la lentille et l'image à 60 cm ?","option_a":"γ = 2","option_b":"γ = -2","option_c":"γ = 0,5","option_d":"γ = -0,5","option_e":"","option_f":"","bonne_reponse":"b","explication":"Le grandissement γ = OA'\/OA = -60\/30 = -2. Le signe négatif indique que l'image est inversée.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"γ = 2\", \"b\": \"γ = -2\", \"c\": \"γ = 0,5\", \"d\": \"γ = -0,5\"}}","_debug_options_count":4},{"id":39335,"question":"Vrai ou Faux ? La réflexion totale peut se produire uniquement si la lumière passe d'un milieu moins réfringent vers un milieu plus réfringent.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"La réflexion totale se produit uniquement si la lumière passe d'un milieu plus réfringent vers un milieu moins réfringent, avec un angle d'incidence supérieur à l'angle limite.","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":39336,"question":"Quelle est la relation entre la distance focale f, la distance objet OA et la distance image OA' pour une lentille mince ?","option_a":"1\/f = 1\/OA + 1\/OA'","option_b":"1\/f = 1\/OA - 1\/OA'","option_c":"f = OA + OA'","option_d":"f = OA * OA'","option_e":"","option_f":"","bonne_reponse":"b","explication":"La formule de conjugaison pour une lentille mince est 1\/f = 1\/OA' - 1\/OA.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"1\/f = 1\/OA + 1\/OA'\", \"b\": \"1\/f = 1\/OA - 1\/OA'\", \"c\": \"f = OA + OA","_debug_options_count":4},{"id":39337,"question":"Vrai ou Faux ? Une image formée par un miroir concave est toujours réelle.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"Une image formée par un miroir concave peut être réelle ou virtuelle selon la position de l'objet par rapport au foyer.","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":39338,"question":"Quel est l'indice de réfraction de l'eau si la vitesse de la lumière dans l'eau est de 2,25 × 10⁸ m\/s ? (On prend c = 3 × 10⁸ m\/s)","option_a":"1,33","option_b":"1,5","option_c":"1,67","option_d":"1,25","option_e":"","option_f":"","bonne_reponse":"a","explication":"L'indice de réfraction n = c\/v = (3 × 10⁸) \/ (2,25 × 10⁸) = 1,33.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"1,33\", \"b\": \"1,5\", \"c\": \"1,67\", \"d\": \"1,25\"}}","_debug_options_count":4},{"id":39339,"question":"Vrai ou Faux ? La vergence d'une lentille divergente est toujours positive.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"La vergence d'une lentille divergente est toujours négative, car sa distance focale est négative.","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}]