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    For the past 15years, factory owner Kamal Parmar has been running an after-school program for slum kids in Ahmedabad, India, helping them with basic skills like reading and writing and even preparing for their school tests.

    Parmar's story began one afternoon 15 years ago. He stopped a few kids returning home from the local school and took their exam paper and asked them a few questions. Shockingly, he made a shocking discovery--the students, even the older ones, knew nothing about reading except the alphabet. And that left him thinking that something should be done for these children.

    So he invited the kids to visit his workshop every evening, where he set up a temporary classroom with metal desks. The shabby school started off with 10 students. Today, the Footpath School has a total of 155 students and many of the kids that Parmar has taught in the past 15yearshav e gone to attend college and build successful careers.

    Despite having studied only till the seventh grade, he has been able to teach the kids by inventing creative techniques. He asks them to read first and then to form questions on their own and read them out. In this way, many kids learn all seven subjects in six months.

    Parmar's family are very supportive of his project and are proud to see how much of an impact he has had on the kids. His students love him. Ten of his ex-students are currently serving as teachers at the school and he doesn't have to employ any teachers.

    For those who are inspired by his story, but can't actually volunteer at school, Parmar has a simple piece of ads ice: “Try to educate just one child a year, and see the difference it makes to the society.”

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小燕多次乘车了解到夜间开汽车,若车内亮灯,车内物体会在前面的挡风玻璃上成清晰的像,干扰司机的视线,影响行车安全。为今后安全行车,小燕根据生活中透明平板玻璃所成像“明”、“暗”不同的多种情况做以下探究:

【提出问题】物体在透明平板玻璃中成像的“明”、“暗”程度与哪些因素有关?

【进行猜想】

猜想1:透明平板玻璃成像的“明”、“暗”程度可能与物体离光源的距离有关;

猜想2:透明平板玻璃成像的“明”、“暗”程度可能与光源的强度有关;

猜想3:透明平板玻璃成像的“明”、“暗”程度可能与物体的颜色有关。

【进行实验,收集数据】

实验一:如图所示,在水平桌面上竖直固定一块透明平板玻璃,同一物体固定在离透明平板玻璃0.5m的A点,在桌面的C点先后用不同功率的灯照亮A点处的物体,观察同一物体不同光照下在透明平板玻璃中所成像的“明”“暗”程度。各次实验人的眼睛都在同一位置从右向左观察物体在透明玻璃板中的像。结果记入下表。

灯的功率/W

物体和灯的距离/m

像的明暗程度

5

1

25

1

较暗

40

1

实验二:同一物体位置固定在A点不动,用同一盏5W的灯先后在桌面BCD三点照亮A处的同一物体,同一位置观察同一物体在透明平板玻璃(仍固定不变)中成像的“明”“暗”程度。结果记入下表。

灯的功率/W

物体和灯的距离/m

像的明暗程度

5

0.5

5

1.0

较明

5

1.5