四年级科学（影子练习）

光被物体阻挡会…

• 形成影子

• 会反射

• 会折射

…会影响影子的大小

• 物体与光源照射的方向

• 物体与光源的距离

• 物体与光源的大小

哪个因素会影响影子的大小？

Which of the following factor that causes the change in the size of shadow?

• 光源与屏幕之间的距离

  The distance between the light source and the screen

• 物体与屏幕之间的距离

  The distance between the object and the screen

• 光源的位置

  The position of the light source

• 物体的形状

  The shape of the object

哪个因素会影响影子的形状？

Which of the following factor that causes the change in the shape of shadow?

• 光源与屏幕之间的距离

  The distance between the light source and the screen

• 物体与屏幕之间的距离

  The distance between the object and the screen

• 物体摆放的方式

  The position of the object

• 物体的大小

  The size of the object

圆柱体有可能形成哪种形状的影子, 除了。。。

Which of the following shadows probably shows with the cylinder, except ......

• 三角形 triangle

• 圆形 circle

• 长方形 rectangle

上图显示物体被放在手电筒的前面。

哪项影子出现在白幕上？

Diagram above shows an object that is placed in front of a torch light.

Which of the following shows the shape of the shadow that can be seen on the screen?

• 
• 
• 
• 

上图显示一个塑胶球被放在手电筒的前面。

哪项句子说明这项实验的观察？

R - 光沿着直线传播 S- 光被反射

T - 光可以透过物体 U- 光被不透明的物体阻挡

Diagram above shows that a rubber ball is placed in front of a torch light。

Which of the following statements explains the observation?

R - Light travels in straight lines

S - Light is reflected

T - Light can travel through objects

U - Light is blocked by opaque object

• R & S

• R & T

• R & U

• T & U

上图显示一项实验。

根据上述实验，我们可作出什么结论？

Diagram above shows an investigation.

Based on the diagram, what conclusion can be made from the investigation ?

• 光源与物体的距离越近，形成的影子越小。

  When the light source is nearer the object, the size of the shadow decrease.

• 光源与物体的距离越远，形成的影子越小。

  When the light source is further away from the object, the size of the shadow decrease.

• 物体与白幕的距离越近，形成的影子越大。

  When the object is nearer the screen, the size of the shadow increase

• 物体与白幕的距离越远，形成的影子越小。

  When the object is further away from the screen, the size of the shadow decrease.

上图显示一项实验。 如果其中一张卡被移动去一边，

P不能看见蜡烛的光。 这项实验的结论是什么？

Diagram above shows an apparatus set up for an investigation. It is found that the candle flame cannot be seen form P if one of the cards is moved a little to the side.

What conclusion can be made form this investigation ？

• 光可以反射 Light can be reflected

• 光可以分散 Light can be dispersed

• 光可以折射 Light can be refracted

• 光沿着直线传播 Light travels in a straight line

哪个不透光

• 透明体

• 半透明体

• 不透明体