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如图所示在“探究凸透镜成像”的实验中,凸透镜焦距为15cm. (1)实验前应首先调整蜡烛、凸透镜、光屏,使烛焰、凸透镜、光屏三者中心大致在同一高度,其目的是 . (2)如图所示,光屏应在 ...
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在研究凸透镜成像的实验中光屏上出现清晰的烛焰的像如图13所示则此时蜡烛到凸透镜的距离所在的范围是利用
在探究凸透镜成像特点的实验中1将凸透镜正对太阳时在凸透镜的另一侧前后移动光屏屏上会在距凸透镜15cm
小明在探究凸透镜成像规律的实验中根据测得的数据得到了物距u跟像距v之间关系的图象如图所示则下列判断正
该凸透镜的焦距是20cm
当u=15cm时,在光屏上能得到一个缩小的像
把物体从距凸透镜15cm处移动到30cm处的过程中,像逐渐变小
当u=25cm时成放大的像,投影仪就是根据这一原理制成的
在探究凸透镜成像的实验中1让一束平行光射向凸透镜得到图甲所示的光路由图可知该凸透镜的焦距为cm2如图
某班同学在探究凸透镜成像规律的实验中记录并绘制了物体到凸透镜的距离n跟像到凸透镜的距离之间关系的图像
该凸透镜的焦距是20cm
当“=15cm时,在光屏上能得到一个缩小的像
当u=25cm时成放大的像,投影仪就是根据这一原理制成的
把物体从距凸透镜lOcm处移动到30cm处的过程中,像逐渐变小
某同学在做探究凸透镜成像规律实验中当光屏距离凸透镜为15cm时得到缩小的像当光屏距离凸透镜25cm时
小乐在探究凸透镜成像规律实验装置图分别如图所示1当蜡烛到凸透镜的距离为20cm时移动光屏直到光屏上成
如图11所示在探究凸透镜成像规律的实验中凸透镜的焦距为10cm1如图蜡烛烛焰的像在光屏的上部为了使像
小刚用蜡烛凸透镜和光屏探究凸透镜成像的规律其实验装置如图所示要使像能够成在光屏的中央应将图中的光屏向
研究凸透镜成像规律时将凸透镜正对着太阳在距透镜15cm的光屏上得到一个最小最亮的光斑则该凸透镜的焦距
在探究凸透镜成像规律的实验中已知凸透镜的焦距为15cm若将蜡烛放在离凸透镜10cm处时移动光屏在光屏
倒立缩小的实像
倒立放大的实像
正立放大的虚像
无像
在探究凸透镜成像规律的实验中1我们需要让蜡烛凸透镜光屏的中心在同一高度这样做的目的是.2其中的一次实
小军同学利用焦距为15cm的凸透镜做了探究凸透镜成像规律的实验实验中当光屏距凸透镜18cm时会在光屏
某班同学在探究凸透镜成像规律的实验中记录并绘制了物体到凸透镜的距离u跟像到凸透镜的距离v之间关系的图
该凸透镜的焦距是20cm
当u=15cm时,在光屏上能得到一个缩小的像
当u=25cm时成放大的像,投影仪就是根据这一原理制成的
把物体从距凸透镜lOcm处移动到30cm处的过程中,像逐 渐变小
在探究凸透镜成像规律的实验中所用凸透镜的焦距为15cm当物体距离凸透镜40cm时在光屏上得到清晰的像
倒立、缩小的实像
倒立、等大的实像
倒立、放大的实像
正立、放大的虚像
某同学在做透镜成像的实验时将一支点燃的蜡烛放在距离透镜20cm的地方当它向透镜移动时其倒立的像移动速
是凸透镜,焦距为20cm
是凸透镜,焦距可能为15cm
是凸透镜,焦距为10cm
是凹透镜,焦距可能为15cm
在探究凸透镜成像规律的实验中小刚同学用焦距分别为5cm10cm15cm的凸透镜做实验实验装置如图21
在用光具座研究凸透镜成像规律的实验中1测量凸透镜的焦距如图所示则该凸透镜的焦距为_________c
在做观察凸透镜成像的实验时物体放在距离凸透镜15cm处在光屏上得到一个倒立放大的实像则该凸透镜的焦距
5cm
10cm
20cm
30
在探究凸透镜成像规律的实验中已知凸透镜的焦距为15cm若将蜡烛放在离凸透镜10cm处时移动光屏在光屏
倒立缩小的实像
倒立放大的实像
正立放大的虚像
无像
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2008年北京奥运会的比赛门票开始接受公众预定.下表为北京奥运会官方票务网站公布的几种球类比赛的门票价格某球迷准备用12000元预定15张下表中球类比赛的门票 1若全部资金用来预定男篮门票和乒乓球门票问这个球迷可以预订男篮门票和乒乓球门票各多少张 2若在准备资金允许的范围内和总票数不变的前提下这个球迷想预定上表中三种球类门票其中足球门票与乒乓球门票数相同且足球门票的费用不超过男篮门票的费用问可以预订这三种球类门票各多少张
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计算2cos30°﹣|﹣1|+﹣1.
已知如图①②在矩形ABCD中AB=4BC=8PQ分别是边BCCD上的点. 1如图①若AP⊥PQBP=2求CQ的长 2如图②若且EFG分别为APPQPC的中点求四边形EPGF的面积.
把多项式8a3﹣2a分解因式的结果是.
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已知如图在△ABC中AB=AC点P是底边BC上一点且满足PA=PB⊙O是△PAB的外接圆过点P作PD∥AB交AC于点D. 1求证PD是⊙O的切线 2若BC=8tan∠ABC=求⊙O的半径.
下列几何体中主视图和左视图都为矩形的是
ThemainreasonIwasalittlenervoustogotoInnerMongoliawasthatIdidn'treallyknowwhattoexpect.HoweverIwasinterestedinthehorseridingarcheryanddeliciousfoodthatIhadheardabout. AlsomyfriendandIwouldbetravellingthereandsleepinginatraditionalMongolianyurtwithcompletestrangers.Iwasworriedaboutthisnewanddifficultexperience. Assoonaswegottothegrasslandsafterourlongfive﹣hourjourneybycarweweregreetedwithsteamingbowlsofheartyMongoliannoodles﹣justwhatweneededtogetusinthemoodtoexplore.Wetookawalkaroundthegrasslandsandweresurprised﹣notonlybytheirbeautybutalsobythestrongwindsthatblewdirtintoourhairandnearlyknockedusoffourfeet. Beforelongitwastimetogohorseriding.IwasworriedbecauseitwasthefirsttimeIhadeverriddenahorse.Ididn'tneedtoworrythough﹣wewereallbeginnersbutthehorsesmadeitveryeasyforus.Howevertheydidhaveahabitofturningaroundandgoingtheotherwayfornoreason! Intheeveningweateanothersimpledeliciousmealofroastlamb.Afterwardswehadastrangetask﹣tocollectdung粪便tomakeafire.Intheendwehadagreattimearoundthecampfirethateveninglisteningtomusicandsharingstoriesofourdaywithstrangers.Thatwasthemostexcitingpartofourtrip. Thenwewenttosleepinouryurt.Becausewewereinthegrasslandsthetemperaturedroppedsharplyatnighttoaroundzerosowefeltcoldthroughoutthenighteventhoughsixotherpeopleweresleepingwithus. ThenextdaywewokeupstillfeelingtiredandheadedbacktoHohhotcapitalofInnerMongoliaautonomousregion.Wereallylovedthenicehotelroomwesleptinthatnightandtheshowerthatwashedthedirtoutofmyhair.Howeverwedidn'tregrethavingtheadventureintheInnerMongoliangrasslands. 36.Howdidthewriterfeelbeforethetrip? A.Hefeltnervousaboutexperiencingnewthings. B.Hehadmixedfeelingsaboutthecomingtrip. C.Hecouldn'twaittogoonanadventureintotheunknown. D.Hefeltworriedabouttravellingwithcompletestrangers. 37.ThewriterexperiencedmanythingsinInnerMongoliaEXPECT. A.sleepingintheopenair B.horseriding C.makingafire D.listeningtomusicandsharingstories 38.WhichofthefollowingstatementsisTRUEaccordingtothearticle? A.Thewriterdidnotexpectthewindtobesohard. B.Roastlambwasthewriter'sfavouriteMongolianfood. C.Thewriterthoughtthatcollectingcowdungwasveryunpleasant. D.Sleepingwithothersmadethenightfeellesscoldtothewriter. 39.Whatcanwelearnaboutthewriter'shorseridingexperience? A.Thehorseshadprobablybeentrainedwell. B.Horseridingwasthemostexcitingpartofthewriter'strip. C.Thewriterwaswellpreparedforhishorseridingexperience. D.Thewriter'shorsekeptturningaroundbecausehedidn'tknowhowtocontrolit. 40.Thewriterwrotethisarticlemainlyto. A.showthatitwasthedifficultpartsthatmadehistripgreat B.describewhatInnerMongoliaisreallyliketoreaders C.tellreaderstobebraveandexploretheunknown D.shareaninterestingtravelexperience
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