a. Góc lệch cực tiểu khi i1=i2=i⇒r1=r2=r=A2" role="presentation" style="display: inline; line-height: normal; font-size: 13.3333px; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; color: rgb(20, 20, 20); font-family: Verdana, Tahoma; position: relative; background-color: rgb(255, 255, 255);">i1=i2=i⇒r1=r2=r=A2i1=i2=i⇒r1=r2=r=A2Mặt khác: sin⁡i=nsin⁡r⇒i=arcsin⁡(2sin⁡A2)" role="presentation" style="display: inline; line-height: normal; font-size: 13.3333px; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; color: rgb(20, 20, 20); font-family: Verdana, Tahoma; position: relative; background-color: rgb(255, 255, 255);">sini=nsinr⇒i=arcsin(2√sinA2)sini=nsinr⇒i=arcsin(2sinA2)Do không cho giá trị cụ thể của A nên để i dưới dạng tham số!B. Để không có tia ló thì: sin⁡r2≥1n" role="presentation" style="display: inline; line-height: normal; font-size: 13.3333px; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; color: rgb(20, 20, 20); font-family: Verdana, Tahoma; position: relative; background-color: rgb(255, 255, 255);">sinr2≥1nsinr2≥1n⇒sin⁡(A−r1)≥1n" role="presentation" style="display: inline; line-height: normal; font-size: 13.3333px; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; color: rgb(20, 20, 20); font-family: Verdana, Tahoma; position: relative; background-color: rgb(255, 255, 255);">⇒sin(A−r1)≥1n⇒sin(A−r1)≥1nsin⁡Acos⁡r1−cos⁡Asin⁡r1≥1n" role="presentation" style="display: inline; line-height: normal; font-size: 13.3333px; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; color: rgb(20, 20, 20); font-family: Verdana, Tahoma; position: relative; background-color: rgb(255, 255, 255);">sinAcosr1−cosAsinr1≥1nsinAcosr1−cosAsinr1≥1nsin⁡A1−sin2⁡in2−cos⁡Asin⁡in≥1n" role="presentation" style="display: inline; line-height: normal; font-size: 13.3333px; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; color: rgb(20, 20, 20); font-family: Verdana, Tahoma; position: relative; background-color: rgb(255, 255, 255);">sinA1−sin2in2−−−−−−−−√−cosAsinin≥1nsinA1−sin2in2−cosAsinin≥1n⇒sin⁡Acos⁡i−cos⁡Asin⁡i≥1" role="presentation" style="display: inline; line-height: normal; font-size: 13.3333px; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; color: rgb(20, 20, 20); font-family: Verdana, Tahoma; position: relative; background-color: rgb(255, 255, 255);">⇒sinAcosi−cosAsini≥1⇒sinAcosi−cosAsini≥1⇒tan⁡A≥tan⁡i⇒i≤A" role="presentation" style="display: inline; line-height: normal; font-size: 13.3333px; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; color: rgb(20, 20, 20); font-family: Verdana, Tahoma; position: relative; background-color: rgb(255, 255, 255);">⇒tanA≥tani⇒i≤A
a. Góc lệch cực tiểu khi i1=i2=i⇒r1=r2=r=A2" role="presentation" style="display: inline; line-height: normal; font-size: 13.3333px; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; color: rgb(20, 20, 20); font-family: Verdana, Tahoma; position: relative; background-color: rgb(255, 255, 255);">i1=i2=i⇒r1=r2=r=A2i1=i2=i⇒r1=r2=r=A2Mặt khác: sin⁡i=nsin⁡r⇒i=arcsin⁡(2sin⁡A2)" role="presentation" style="display: inline; line-height: normal; font-size: 13.3333px; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; color: rgb(20, 20, 20); font-family: Verdana, Tahoma; position: relative; background-color: rgb(255, 255, 255);">sini=nsinr⇒i=arcsin(2√sinA2)sini=nsinr⇒i=arcsin(2sinA2)Do không cho giá trị cụ thể của A nên để i dưới dạng tham số!B. Để không có tia ló thì: sin⁡r2≥1n" role="presentation" style="display: inline; line-height: normal; font-size: 13.3333px; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; color: rgb(20, 20, 20); font-family: Verdana, Tahoma; position: relative; background-color: rgb(255, 255, 255);">sinr2≥1nsinr2≥1n⇒sin⁡(A−r1)≥1n" role="presentation" style="display: inline; line-height: normal; font-size: 13.3333px; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; color: rgb(20, 20, 20); font-family: Verdana, Tahoma; position: relative; background-color: rgb(255, 255, 255);">⇒sin(A−r1)≥1n⇒sin(A−r1)≥1nsin⁡Acos⁡r1−cos⁡Asin⁡r1≥1n" role="presentation" style="display: inline; line-height: normal; font-size: 13.3333px; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; color: rgb(20, 20, 20); font-family: Verdana, Tahoma; position: relative; background-color: rgb(255, 255, 255);">sinAcosr1−cosAsinr1≥1nsinAcosr1−cosAsinr1≥1nsin⁡A1−sin2⁡in2−cos⁡Asin⁡in≥1n" role="presentation" style="display: inline; line-height: normal; font-size: 13.3333px; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; color: rgb(20, 20, 20); font-family: Verdana, Tahoma; position: relative; background-color: rgb(255, 255, 255);">sinA1−sin2in2−−−−−−−−√−cosAsinin≥1n=>sinA.cosi-cosa.sini≥1=>tanA≥tan i=>i nhỏ hơn hoặc bằng AsinA1−sin2in2−cosAsinin≥1n⇒sin⁡Acos⁡i−cos⁡Asin⁡i≥1" role="presentation" style="display: inline; line-height: normal; font-size: 13.3333px; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; color: rgb(20, 20, 20); font-family: Verdana, Tahoma; position: relative; background-color: rgb(255, 255, 255);">⇒sin