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Transparent
When light passes straight
through a object, that
object is transparent.
Translucent
You can not see very clearly
through translucent objects,
but light will pass through
them.
Opaque
Opaque objects do not allow any light to
pass through them.
What is Shadow?
• When an object
blocks light, a
shadow is formed.
• Umbra
Formation of Shadow?
1. Object must be
opaque
Formation of Shadow?
1. Object must be opaque
2. Need source of
light
Formation of Shadow?
1. Object must be opaque
2. Need source of light
3. Shadow can seen only
on a screen
Formation of Shadow?
1. Object must be opaque
2. Need source of light
3. Shadow can seen only on a
screen
4. The size of shadow
depends on the position
of source of light
Formation of Shadow?
1. Object must be opaque
2. Need source of light
3. Shadow can seen only on a
screen
4. The size of shadow depends
on the position of source of
light
5. Shadows are in black
in color
Formation of Shadow?
• Object must be opaque
• Need source of light
• Shadow can seen only on a screen
• The size of shadow depends on the position of
source of light
• Shadows are in black in color
Quick Revision
• What are Transparent, Translucent and
opaque objects
• What is Shadow?
• Formation of Shadow

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Ligth shadow and reflection part 2

Editor's Notes

  1. Now what is transparent object? If you are able to see clearly through an object means it is allowing light to pass through it, is know as transparent object. For example :Clear Glass piece ,water etc. So if you see through a clear glass as shown in picture, you can see clearly through a glass and can know what is exactly behind the glass. Similarly in second picture, you can see a mouse and some other things inside the glass, Why ? just because, glass is a transparent object. Another daily life example is when you drink water in a glass, you can see the bottom part of the glass from the top of filled water glass, why just because water is transparent object.
  2. Now Translucent-There are some objects through which we can see, but not very clearly and light will pass through them. Such objects are known as translucent. For example: Butter paper, in this picture we can see fingers just below the butter paper but not clearly , In case of LEB bulb, You can not see through the LED Bulb, but light will pass through them.
  3. Now what is opaque objects ? Opaque objects do not allow any light to pass through them. You cannot see through an opaque object at all. And because of his opaque objects form shadow.
  4. So what is shadow? When an opaque object is placed in path of light, a dark portion is formed on the opposite side of object on the screen. This dark portion is called as shadow. In this picture a doll is placed in path of torch light because doll is blocking the light falling on the wall, it creates a dark screen on the wall this dark portion is known as shadow Now there is the dark region behind object facing light which does not receive light at all, this is known as Umbra
  5. Now the question is How shadow is formed, So First thing, to make a shadow an object must be opaque (opaque means, object does not allow light to pass through) or translucent ( means allows some light to pass through).
  6. 2nd we need source of light, Source of light can natural or artificial but without light shadow can not be formed, One question is asked generally, that can a shadow formed in a dark room? NO without source of light shadow can not be formed.
  7. 3rd Shadow can seen only on a screen Screen could be wall, ground etc One more thing, Shadow are always formed in direction opposite to source of light
  8. 4th The size of shadow depends on the position of source of light, So in the morning your shadow will be different length as compare to afternoon
  9. 5th Shadows are in black in color, here in this picture if u see color of hand is different from shadow, shadow is always black. Another example you can take a red and yellow rose will have same black shadows.
  10. So Shadow is formed, When an opaque object is placed in path of light. So, it Needs a source of light Shadow can seen only on a screen Shadow are always formed in direction opposite to source of light The size of shadow depends on the distance of source of light and on the angle at which the light rays fall on the object. If the source of light is closer to the object, a larger shadow is formed than when the source of light is far from the object. Shadows are in black in color and this is not changed by the color of the opaque objects. So a red and yellow rose will have same black shadows.
  11. So till now we have understood about What are Transparent, Translucent and opaque objects What is Shadow? Formation of Shadow Now we will see in next part.