1.----Where did you put the key?
------Oh,I______I put them on the chair because the phone rang as I ______in.
A.remembered,come B.remembered,was coming C.remember ,come D,remember.was coming
2,------Mr Johnson asked me to remind you of the meeting this afternoon.Don't forget it!
-------OK,I_______.
A.won't B.don't C.will D.do
3,解释一下凸面镜为什么扩大视野
1.----Where did you put the key?
------Oh,I______I put them on the chair because the phone rang as I ______in.
A.remembered,come B.remembered,was coming C.remember ,come D,remember.was coming (现在时刻说“记得”,用现在时;进来是故去的时候,过去式)
2,------Mr Johnson asked me to remind you of the meeting this afternoon.Don't forget it!
-------OK,I_______.
A.won't B.don't C.will D.do (对于Don't forget 的回答)
3.解释一下凸面镜为什么扩大视野
对于平行光是发散,但看物体的反射光不是平行光,正是这种发散,导致成像位置显得更远更小,视角就更大,视野就开阔了,和猫眼是一个道理。
也用光路可逆来分析。
眼睛当成光源,那么发出的光经凸面镜的反射后,到达的区域比同样大小的平面镜大,所以这些区域物体发出的光也能到达眼睛,所以凸面镜观察范围要大。
B
A
凸透镜聚光,即大范围的光经凸透镜会汇聚为一点(但不一定),根据光路可逆性,从汇聚的那点看过去,既看到大范围的光,也就是扩大了视野。
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