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Published on: 18/09/2019
Light, Shadows and Reflections
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Questions + Answers key
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1.
Why is the shadow of an aeroplane flying high in the sky not seen on the ground?
2.
Distinguish between transparent and translucent object
3.
What are the conditions for formation of shadow?
4.
What do you understand by incandescent body?
5.
We see moon shining in the sky, then why is it called non-luminous?
6.
What property of light is responsible for the formation of shadows and pinhole images?
7.
What do we see on the ground, when sunlight falls on the opaque objects?
8.
Can we see any object in a completely dark room?
9.
How do we see the objects around us?
10.
Do the shadows look different in colour when the colours of the objects are different?
11.
As we know that moon appears to be bright at night. Does it mean that it is an luminous object?
12.
Mention the type of image is formed in pinhole camera.
13.
If an object is of two different colours, then what will be the colour of shadow?
14.
Mention the name of an object which partially allows the light to pass through it.
15.
Mention the name of an object which does not allow the light to pass through it.
1.
The shadow of an aeroplane flying high in the sky is not seen on the ground because the ground will not act as screen for the aeroplane due to its high distance from the ground.
2.
| S.No | Translucent object | Transparent object |
|---|---|---|
| (a) | They allow the light to pass partially through them. | Allow light to pass through them completely. |
| (b) | Objects can be seen, but not dearly | Objects can be seen clearly. |
| (c) | Butter paper and wax paper are examples of objects. | Glass and Air are examples of objects. |
3.
We need light source, opaque object and a screen
4.
If we make a metal red hot, it emits light. This is called incandescent body
5.
Moon shines because of sun's light falling on it.
6.
The light travels in a straight line path.
7.
We see the shadows of opaque objects on the ground, when sunlight falls on these objects.
8.
No, we can not see any object in a completely dark room.
9.
We can see the objects around us with the help of light.
10.
No, the shadows are same for different colour of object, it is always black. Some portion of the shadow may be grey.
11.
Moon doesn't produce its own light, the brightness of moon is due to the light of sun. So, it is not a luminous object.
12.
Inverted and real image is formed in pinhole camera.
13.
If an object is of two different colours, then the colour of shadow will be black.
14.
The object which partially allows the light to pass through it is a translucent Object, e.g. wax paper.
15.
The name of an object which does not allow the light to pass through it is an opaque object, e.g. wood.
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