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प्रश्न
Select the correct alternative.
Penumbra is a region of
पर्याय
complete darkness
complete brightness
partial brightness
none of the above
उत्तर
partial brightness
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संबंधित प्रश्न
Select the correct alternative.
Umbra is a region of
Draw a ray diagram to show the formation of the shadow of an opaque object by a point source of light. How is the size of shadow affected if the screen is moved away from the object?
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 umbra 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?
What is penumbra?
When does a shadow form?
What are the essential conditions for the formation of shadow?
What are the properties of shadow?
The ______ is the darkest part of a shadow.
Which of the following can never form a circular shadow?
Three torches A, B, and C shown in Fig. 11.7 are switched on one by one. The light from which of the torches will not form a shadow of the ball on the screen.
Correct the following statements.
- The color of the shadow of an object depends on the color 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?
A football match is being played at night in a stadium with flood lights ON. You can see the shadow of a football kept at the ground but cannot see its shadow when it is kicked high in the air. Explain
