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प्रश्न
What is a shadow? Give a reason for its formation.
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उत्तर
When light falls on an opaque object, light is obstructed and a dark patch on a screen kept behind is called a shadow. This is because light propagates in straight line. If the distance between the object and screen is less, the shadow will be (umbra) dark and smaller.
If the distance is increased shadow will be dim and larger.
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संबंधित प्रश्न
Fill in the blank.
The darkest portion of a shadow is called the ................
State two differences between an umbra and a penumbra.
Draw a ray diagram to show the formation of umbra alone.
In the following diagram, draw rays to form a penumbra on the screen.
Why is it that the birds flying in the sky do not cast their shadow on the earth?
Tick the correct answer.
Umbra is a region of
Answer the following.
How is a shadow formed? Write the conditions required for a shadow to form.
When does a shadow form?
How does the colour of an opaque object affect the colour of the shadow?
What do we need in order to see a shadow?
Sivarajan placed a meter stick in the playground at 7.00 am in the morning. How will the shadow of the stick at noon look in comparison to the one in the morning
What is a shadow? What things are necessary for the formation of a shadow?
______ is always against, opposite side of light source.
The ______ is the darkest part of a shadow.
The lighter shade of shadow is the ______.
Which of the following can never form a circular shadow?
Correct the following statements.
- The colour of the shadow of an object depends on its colour of the object.
- Transparent objects allow light to pass through them partially.
On a sunny day, does a bird or an aeroplane flying high in the sky cast its shadow on the ground? Under what circumstances can we see their shadow on the ground?
