题干

在“探究凸透镜成像规律”的实验中

(1)实验装置正确安装并调节后,小芳同学某次实验情景如图所示,此时她在光屏上看到了烛焰清晰的像,生活中的____ 就是利用这一原理制成的.

(2)实验过程中,如果用不透明的硬纸板档住凸透镜的上半部分,则光屏上的像____ .

A.只出现烛焰像的上半部分       B.只出现烛焰像的下半部分

C.出现烛焰完整的像,但像更小了  D.像仍然是完整的,且大小不变,只是变暗了

(3)如果保持蜡烛和凸透镜的位置不变,把光屏向右移一小段距离后,要想在光屏上再次得到清晰的像,可在蜡烛与凸透镜之间放一个____ (选填“近视眼镜”或“远视眼镜”).

(4)实验过程中,燃烧的蜡烛在不断缩短,导致光屏上的像向上移动,为了使烛焰的像能成在光屏中央,在不更换实验器材的情况下,请写出一种可行的方法:____ .

 

上一题 下一题 0.0难度 选择题 更新时间:2018-02-11 03:29:27

答案(点此获取答案解析)

照相机,D,近视眼镜,将蜡烛向上调节(或将凸透镜向下调节或将光屏向上调节)

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    As I grow up, I gradually know that life plays a very important role in my education I really wanted to achieve. What I mean is that life can teach you things no one else can. Luckily for you, it's time to have lessons of life. Pay attention and you can know what I call the school of life.
    Use Your Head
    You have to be smart to survive (生存) in this world. Anytime you need to make a move, stop and think. Obviously there will be times when you need to take action first, but if you've been taking the time to plan, you'll always make the right choice. Fail to plan, plan to fail.
    Set Your Goals
    In my team, if you don't finish the job well, we will fire you. Your goals should be on building a basic of solid and complete work. Make certain a list of what you have to do and start with the biggest and most difficult task. The key here is goals.
    Respect Your Superiors (上级)
    Your boss is in his position for a reason, no matter what you think of him. If he's not the best one, be patient—he'll be out of there soon. In the meantime, you have to respect him as your superior. That means following orders and closing your mouth. If you don't respect your boss, how will you expect the people under you to do the same?
    Keep Your Cool
    You should never let your emotions (情绪) control you. You should learn to keep calm. Never lose your cool when dealing in business, or it will ruin the whole thing.
    The school of life can be hard, but if you're smart and play your cards right, you can come out with an A+. Just treat every situation as a learning experience. I hope you've studied.