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Light and Sight - lesson 4
Light and Sight - lesson 4
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1
The light waves travel in the air as...........
circular lines.
straight lines.
curved lines.
zigzag lines.
2
When light rays hit an object, all the following sentences are correct, except...........
some of this rays may go through the object.
some of this rays reflects to our ears causing hearing.
some of this rays is absorbed by the object.
some of this rays is bounced off the object.
3
When light hits an object, a shadow of this object is formed because............
light can pass through object.
this object is a transparent object.
this reflects light.
light cannot pass through the object.
4
Opaque material............
absorbs some of light that fall on it only.
bounces off some of light that fall on it only.
allows light to pass through.
absorbs some of light that fall on it and bounces off the other.
5
All of the following are transparent objects, except............
air.
water.
paper.
glass.
6
You cannot see through all the following objects, except..........
painted surface.
a glass of water.
human body.
polished mirror.
7
Opaque objects and transparent objects are characterized by...........
both of them absorb all falling light.
both of them allow all falling light to pass through.
both of them reflect all falling light.
transparent objects allow most of light to pass through, while opaque objects don't.
8
Painted surface........... the incoming light rays.
absorbs and reflects
absorbs only
allows to pass
reflects only
9
Polished mirror, causes falling light rays.........
to diffuse like that of rough surfaces.
to reflect at the same angle they strick the polished mirror. polished mirror.
to pass through it.
to reflect at different directions they strick the polished mirror.
10
Our eyes,..............
cannot see both opaque and transparent objects.
can see opaque objects, while transparent objects cannot be seen.
can see transparent objects, while opaque objects cannot be seen.
can see both opaque and transparent objects.
11
If the passed light rays from a transparent objects is fallen on an opaque object then the opaque object........ through the transparent object.
don't reflect any light rays, so we cannot see it
reflects some light rays, so we can see it
absorbs all light rays, so we can see it
reflects some light rays, so we cannot see it
12
If there are two sheets, one made of wood in front of the second that made of glass,..........
the light can pass through both sheets.
you cannot see the wood sheet through the glass sheet.
you can see the glass sheet through the wood sheet.
you can see the wood sheet through the glass sheet.
13
It is a transparent matter, that allows light to pass through
Moon
Reflected light
Polished mirror
lenses
14
It is a rough surface, that scatter reflected light rays.
lenses
Polished mirror
Piece of cloth
Moon
15
It is the light, that bounces of a reflecting surface.
lenses
Moon
Polished mirror
Reflected light
16
It is a smooth shiny surface, that reflects most of falling light
lenses
Polished mirror
Reflected light
Moon
17
It doesn't considered as a source of light, that present in the sky
Reflected light
Moon
Polished mirror
lenses
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