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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.
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?
Tick the correct answer.
Umbra is a region of
What are the essential conditions for the formation of shadow?
Rearrange the boxes given below to make a sentence that helps us understand opaque objects.
| O W S | A K E | O P A Q | U E O | B J E T | T S M |
| S H A D |
The ______ is the darkest part of a 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?
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?
