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प्रश्न
What is a shadow? What things are necessary for the formation of a shadow?
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उत्तर
- Shadows are formed because light travels in straight lines.
- Shadow is always against, opposite side of light source.
- Shadow is formed by opaque objects that stop high from propagating.
- Things necessary for the formation of shadow: source of light, opaque object
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संबंधित प्रश्न
Select the correct alternative.
Umbra is a region of
What is a shadow? Give a reason for its formation.
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?
Draw a ray diagram to show the formation of umbra alone.
Draw a ray diagram to show the formation of umbra and penumbra both. Label the parts umbra and penumbra in your diagram.
State the conditions when only the penumbra of an opaque object is obtained on the screen.
Tick the correct answer.
Umbra is a region of
What is shadow?
What is penumbra?
What are the essential conditions for the formation of shadow?
How does the colour of an opaque object affect the colour of the shadow?
______ is always against, opposite side of light source.
Which of the following can never form a circular shadow?
Three torches A, B and C shown in the following figure 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 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?
Three identical towels of red, blue and green colour are hanging on a clothes line in the sun. What would be the colour of shadows of these towels?
