题目

B Increasing Noise Annoys People want action on noise, a recent public meeting in Brisbane showed. Some want technical improvements such as quieter air conditioners or better sound barriers around major roads. Others want tougher laws to restrict noise from building sites or to require owners to take responsibility for barking dogs. But the highest priority (优先) was a noise complaints system that works. Brisbane City Council receives more complaints about noise than all other problems put together. So it conducted survey and found that about half its citizens are upset by noise in one form如图所示，某同学在做探究平面镜成像特点时，实验时，将一块玻璃板竖直架在一把直尺的上面，再取两段等长的蜡烛A、B，一前一后竖直放在直尺上，实验过程中眼睛始终在蜡烛A的一侧进行观察。⑴点燃蜡烛A，调节蜡烛B的位置，如图甲直到B与A在玻璃后成的像______________时，B的位置即为A的像所在的位置。⑵直尺的作用是便于比较物与像____________的关系；两段蜡烛等长是为了比较物与像____________的关系。⑶若将点燃的蜡烛A远离玻璃一段距离，它在玻璃中成的像大小将____________（选填“变大”、“变小”或“不变”）⑷若点燃的蜡烛在玻璃前25cm处，现将一不透明的挡板放在玻璃后12cm处，如图乙，这时________（选填“仍能”或“不能”）在镜中看到蜡烛的像。