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范例5凸透镜面对阳光
发布时间:2021-06-18 00:03访问

THERE ARE STILL MANY SUCH QUESTIONS IN THE EXAM.THE OBJECT DISTANCE BECOMES SMALLER,CAMERA CLOSE TO CLASSMATES

一种。大于20CM

C.THE OBJECT DISTANCE OF 31CM IS GREATER THAN 2 TIMES THE FOCAL LENGTH,BECOMES AN INVERTED AND REDUCED REAL IMAGE,THE ANSWER IS

B.将投影机从屏幕上移开,同时将幻灯片移近相机

①当物镜到凸透镜的距离(物镜距离)大于焦距的2倍(或不是焦距的2倍)时,缩小真实图像可能是相反的。15CM小于30CM,15CM应该在2倍焦距和焦距之间,30CM应该在2倍焦距之外,所以,它成为上下颠倒的放大实像。但,所有这些都可以通过我们总结的知识来解决

D。可能会变成缩小的真实图像

ONE KIND.根据凸透镜的成像特性,我们发明了许多光学元件例如, 相机。将投影机从屏幕上移开,还要使幻灯片远离镜头

此外,从对凸透镜①②③的成像特性的进一步分析中可以得出这一结论。为了方便记忆,我们可以简单地写:

"EIGHT LAWS OF CONVEX LENS IMAGING".BETWEEN 10 CM AND 20 CM

EXAMPLE 4: WHEN USING THE CAMERA TO TAKE PICTURES,THE OBJECT IS FORMED ON THE FILM ()

B。

一种。将投影机移近屏幕,同时, 将幻灯片移近镜头。ENLARGE AN UPRIGHT VIRTUAL IMAGE

示例1凸透镜的焦距F等于15CM,将物体放在距光学中心31厘米的主光轴上时,图片必须为()

B. ANALYSIS: ACCORDING TO THE KNOWLEDGE POINTS ⑥,WE KNOW,AFTER BLOCKING PART OF THE LIGHT FROM ENTERING THE LENS,WILL MAKE THE IMAGE DARKER,SO THE ANSWER IS D.THE DISTANCE FROM THE SLIDER TO THE LENS IS THE OBJECT DISTANCE.EXPLAIN THAT 15 CM IS BETWEEN 2 TIMES THE FOCAL LENGTH AND THE FOCAL LENGTH,WE WRITE IT AS F

EXAMPLE 3: WHEN PERFORMING "CONVEX LENS IMAGING",如果将蜡烛放在离凸透镜15CM的地方,可以在距镜头30CM的光屏上获得清晰的图像,喜欢 ________,__________的真实图像。滑近镜头,投影机离屏幕很远,选择D作为答案。 一种。照片中的所有场景都比正常场景暗

②从物镜到凸透镜的距离大于焦距但小于焦距的2倍(在焦距和焦距的2倍之间)时,它可以是放大的真实图像,上下颠倒。缩小后的真实图像

范例6:春季班是在班级中组织的,当同学用相机拍下另一位同学的照片时,由于疏忽,镜头盖正好覆盖了相机镜头的一半,然后在冲掉这张照片后()

幻灯片投影仪, 投影仪,利用凸透镜的特性来形成上下颠倒的放大实像,在这张幻灯片中,胶片应放置在2倍焦距和焦距之间,而且由于此时形成的东西似乎是颠倒的,因此,为了看到正面的图像, 幻灯片将倒置放在幻灯片支架上。可能是放大的虚拟图像

D.让我们再举一个例子来理解这一知识点。让相机远离同学,前镜头调整

ANALYSIS: WHEN THE OBJECT DISTANCE IS 15CM, IT BECOMES AN ENLARGED IMAGE ON THE LIGHT SCREEN.THEN,THE SCENE TO BE SHOT SHOULD BE OUTSIDE THE 2X FOCAL LENGTH OF THE CAMERA LENS.

C.它是焦距中的虚像,焦距以外的真实图像; 放大倍数为焦距的2倍,缩小后的图像是焦距的2倍以上; 简单的说:

C.REAL IMAGE AFTER REDUCTION

TYPICAL EXAMPLE

B.

相机利用凸透镜的特性来形成上下颠倒的真实图像。

分析:这类问题比较简单,相机是上下颠倒的真实图像,选择D作为答案

C。

⑥ IF YOU USE PAPER TO BLOCK PART OF THE CONVEX LENS WHEN DOING THE EXPERIMENT,THE IMAGE ON THE LIGHT CURTAIN IS STILL INTACT,IT SEEMS DARKER.UPRIGHT REAL IMAGE

IN ORDER TO APPLY THIS CONVEX LENS IMAGING PRINCIPLE DIRECTLY TO THE STUDY OF THESE ELEMENTS,WE NO LONGER PROVIDE EXAMPLES FOR ANALYSIS,SOME ARE SLIGHTLY MORE COMPLICATED,WE NEED TO COMBINE THE KNOWLEDGE WE HAVE SUMMED UP TO REASON.ENLARGE THE UPSIDE-DOWN VIRTUAL IMAGE

D。WHEN THE IMAGE IS A BIT SMALL AND I WANT TO ENLARGE THE IMAGE,INTRODUCE THE KNOWLEDGE ACCORDING TO THE KNOWLEDGE POINTS: THE IMAGE DISTANCE IS LARGE,THE SMALL OBJECT DISTANCE IS WELL KNOWN,TO MAKE THE IMAGE BIGGER,REDUCE THE OBJECT DISTANCE AND INCREASE THE IMAGE DISTANCE.ONLY HALF OF THE SCENE IN THE PHOTO

示例8使用具有相同焦距的相机拍摄同学的照片,底片上有清晰的全长图像,如果您想更改胸围,则应该()

③WHEN THE DISTANCE FROM THE OBJECTIVE LENS TO THE CONVEX LENS IS LESS THAN THE FOCAL LENGTH (WITHIN THE FOCAL LENGTH),VERTICALLY ENLARGED VIRTUAL IMAGE

一种。

在分析由凸透镜成像的测试部位之前,我们必须熟悉凸透镜成像的特性,因为它们是实际问题的基础。照片中没有场景

④WHEN IT BECOMES A REAL IMAGE,THE IMAGE AND THE OBJECT ARE ON BOTH SIDES OF THE CONVEX LENS; WHEN IT BECOMES A VIRTUAL IMAGE,THE IMAGE AND THE OBJECT ARE ON THE SAME SIDE OF THE CONVEX LENS

THE真实影像的影像距离较大,物距很小。所以答案应该是

C.颠倒缩小实际图像

分析:在这里我们知道了物距和像距,根据总结的知识点⑤,当物体的焦距超过2倍时,图像在焦距和焦距的2倍之间; 当物体在焦距和焦距的2倍之间时,图像焦距小于2倍。这些特征是通过实验获得的:

⑤当物距大于焦距的2倍时,从图像到凸透镜的距离(图像距离)在焦距和焦距的2倍之间; 当物距在焦距和焦距的2倍之间时,图像距离在2倍焦距之外。如果您使用此镜头观察邮票上较小的图案,从图章到镜头的距离应为()

D.SMALL IMAGE DISTANCE IS SMALL,THE OBJECT DISTANCE IS LARGE. ONE KIND.

EXAMPLE 2 CARRY OUT CONVEX LENS IMAGING EXPERIMENT,WHEN THE CANDLE IS 15 CM AWAY FROM THE LENS,ZOOM INTO AN IMAGE ON THE LIGHT CURTAIN,WHEN THE CANDLE IS 18CM AWAY FROM THE LENS,THE RESULTING PICTURE()

分析:第一张照片是全长肖像,在同一部大电影中又来了半身像,与全长肖像相比, 胸围似乎更大,根据知识点⑧:当图像变大时, 图像距离变大,镜头的前向调节远非负面因素。将投影机移近屏幕,还要使幻灯片远离镜头

范例5凸透镜面对阳光,距凸透镜10厘米处可获得最小和最亮的点。

D.

D.KEEP THE CAMERA AWAY FROM CLASSMATES,ADJUST THE LENS BACKWARD

B。THE SCENE IN THE PHOTO IS HALF BRIGHT AND HALF DARK

ACCORDING TO THE CONCLUSION DRAWN BY MULTIPLYING THE FOCAL LENGTH BY 2 TIMES,WE CAN ALSO INFER: WHEN IT BECOMES A REAL IMAGE,WHEN THE OBJECT IS CLOSE TO THE CONVEX LENS,THE PICTURE WILL BE LARGER AND THE IMAGE DISTANCE WILL BE LARGER; WHEN THE OBJECT IS FARTHER AWAY FROM THE CONVEX LENS,THE PICTURE WILL BECOME SMALLER,THE IMAGE DISTANCE WILL BE SMALLER.MUST BE A REDUCED REAL IMAGE

EXAMPLE 7 WHEN DISPLAYING A SLIDESHOW,THE IMAGE ON THE SCREEN IS TOO SMALL,WANT TO ENLARGE THE IMAGE,THE METHOD THAT CAN BE USED IS ()

SOURCE: THE SOURCE OF THIS ARTICLE IS THE DAILY PRACTICE OF BAIJIAHAO PRIMARY AND SECONDARY SCHOOL,THE COPYRIGHT BELONGS TO THE RELEVANT RIGHT HOLDER,SUCH AS INFRINGEMENT,PLEASE CONTACT DELETE

THE PROBLEM TYPE IS MORE COMPLICATED,SUCH AS:

D。超过10厘米

AFTER FINDING THESE EIGHT LAWS OF CONVEX LENS IMAGING,NO MATTER WHAT TYPE OF PROBLEM ARISES,WE CAN ALL EASILY DEAL WITH DISBELIEF?LET US ILLUSTRATE WITH AN EXAMPLE.

ANALYSIS: THE CONVEX LENS IS FACING THE SUN,GET THE SMALLEST AT A DISTANCE OF 10 CM,THE BRIGHTEST SPOTS,EXPLAIN THAT THE FOCAL LENGTH OF THESE LENSES IS 10 CM

分析:解决此问题时, 我们必须首先弄清楚:投影仪的屏幕和镜头之间的距离是图像距离。必须是放大的真实图像

必须非常精通知识点⑧在这里,如果知识点不熟练,我什至不能谈论分析。THE CAMERA IS CLOSE TO THE CLASSMATE,ADJUST THE LENS BACKWARD

MAGNIFIER,USE THE CHARACTERISTICS OF THE CONVEX LENS TO MAGNIFY THE VIRTUAL IMAGE,AT THIS TIME, THE OBJECT TO BE OBSERVED MUST BE WITHIN THE FOCAL LENGTH.LESS THAN 10CM

ANALYSIS: THIS IS A QUESTION TYPE THAT DIRECTLY APPLIES KNOWLEDGE POINTS.

COMBINED WITH THE CHARACTERISTICS OF CONVEX LENS IMAGING,INSPECTIONS OF THESE OPTICAL COMPONENTS ALSO OFTEN APPEAR IN HIGH SCHOOL ENTRANCE EXAMS.

B.THE CAMERA IS CLOSE TO THE CLASSMATE,FRONT LENS ADJUSTMENT

焦距焦距的一倍分为虚像和实像,DOUBLE THE FOCAL LENGTH IS DIVIDED INTO SIZE.USE IT TO OBSERVE SMALLER OBJECTS,IN OTHER WORDS, USE IT AS A MAGNIFYING GLASS,THE IMAGING CHARACTERISTIC OF THE MAGNIFYING GLASS IS WITHIN THE FOCAL LENGTH OF THE CONVEX LENS,THE OBJECT WILL BECOME A VERTICALLY ENLARGED VIRTUAL IMAGE,SO THE ANSWER IS B.REAL REAL IMAGE

实际上, 我们仍然可以在实验中得出以下结论:

 

 

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