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प्रश्न
State two differences between an umbra and a penumbra.
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उत्तर
Umbra
- It is the portion of shadow where no light reaches from the source of light due to the opaque object.
- It is completely dark.
Penumbra
- It is the portion of shadow where a portion of light from the source of light reaches the shadow even in the presence of the opaque object in between them.
- It is not completely dark but is dim (or less bright).
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संबंधित प्रश्न
Fill in the blank.
The less dark portion of a shadow is called the .................
Select the correct alternative.
Umbra is a region of
Select the correct alternative.
Penumbra is a region of
Draw a ray diagram to show the formation of umbra alone.
In the following diagram, draw rays to form umbra on the screen.
In the following diagram, draw rays to form a penumbra on the screen.
State the conditions when only the penumbra of an opaque object is obtained on the screen.
Why is it that the birds flying in the sky do not cast their shadow on the earth?
Answer the following.
How is a shadow formed? Write the conditions required for a shadow to form.
What is shadow?
What do we need in order to see a shadow?
What are the properties of shadow?
What is a shadow? What things are necessary for the formation of a shadow?
The ______ is the darkest part of a shadow.
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?
