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प्रश्न
What are the properties of shadow?
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उत्तर
Properties of shadow:
- All objects do not form shadows. Only opaque objects form shadows.
- Shadows will be formed in the opposite side of light source.
- It cannot be determined the characteristics of an object by its shadow.
- The shadow will be always darker, whatever may be the color of light rays.
- Light source, opaque object are shadow all are in a straight line.
- The size of shadow depends upon the distance between light source and object and the distance between object and the screen.
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संबंधित प्रश्न
Fill in the blank.
The less dark portion of a shadow is called the .................
What is a shadow? Give a reason for its formation.
State two differences between an umbra and a penumbra.
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
Answer the following.
How is a shadow formed? Write the conditions required for a shadow to form.
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?
What do we need in order to see a shadow?
What are the parts of shadow?
What is a shadow? What things are necessary for the formation of a 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.
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?
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.
A student had a ball, a screen and a torch in working condition. He tried to form a shadow of the ball on the screen by placing them at different positions. Sometimes the shadow was not obtained. Explain.
