我想問03 年mc no.17 中說的凸鏡和凹鏡的性質好有d 怪怪地.
答案係 : D. 凸鏡 虛像
請問凸鏡點解會成虛像?
凸鏡唔係只可以成實像咩?
另外,凸鏡同凸透鏡有咩分別?
佢地的性質係咪唔同??
咁依家會考仲洗唔洗考凸鏡?
點解書好似無教過?
另外,03年 MC NO. 18 有點唔明,
答案是: A. 延長 縮短
要延長我就明,但點解要縮短相機同底片的距離?
咁唔係會將個像放大咩?
最後, 03年 MC NO.34 和36唔識計,
請列條式比我.
THANKS!!!
會考 物理光學
2009-04-01 10:33 pm
回答 (2)
2009-04-03 9:58 am
✔ 最佳答案
Q.17 no need to do if you are sitting for the HKCEE 2009The Question about convex and concave mirror is out of syll.
Q.18 You should need how to do
In order to obtain a smaller image the object distance should increase and the image distance should decrease.
How come the object distance increase thr image will form on the same pt?By drawing ilght diagram, you can know that they are both move in ONE DIRECTION.
Q36. 250kWh/(1.8X260)=534W =B
Q34.Given that the potential difference across EACH bulb is 12V.
The resistance of the bulb P is = 24^2/80 7.2ohm
Power consumed P=V^2/R = 20W
Notice that power is proportion to brightness.
The brightness should be Q>R>S
2009-04-02 5:47 am
03.17我岩岩睇返係cancel左ga~
不過,凸鏡係可以構成虛象的
Image formed by convex lens 有3種
1)實象(即你講果種),有一點focus,影象會掉轉
2)虛象,冇focus,影象直立的
3)form出黎既image咩都睇唔到(但會考唔考)
~~~*~~~~~*~~~~~~~~*~~~~~~~*~~~~~~~~~*
凸鏡同凸透鏡冇分別,同平時帶果d遠視鏡同一個性質
會考絕對會考凸鏡,請睇返近年pastpaper
你係邊本書?
03.18都係cancel左,我問左老師
~~~~~*~~~~~~~~~~*~~~~~~~~
跟住果兩題係electricity,sorry我未溫,聽日覆你^^
不過,凸鏡係可以構成虛象的
Image formed by convex lens 有3種
1)實象(即你講果種),有一點focus,影象會掉轉
2)虛象,冇focus,影象直立的
3)form出黎既image咩都睇唔到(但會考唔考)
~~~*~~~~~*~~~~~~~~*~~~~~~~*~~~~~~~~~*
凸鏡同凸透鏡冇分別,同平時帶果d遠視鏡同一個性質
會考絕對會考凸鏡,請睇返近年pastpaper
你係邊本書?
03.18都係cancel左,我問左老師
~~~~~*~~~~~~~~~~*~~~~~~~~
跟住果兩題係electricity,sorry我未溫,聽日覆你^^
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