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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. - Science

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प्रश्न

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.

संक्षेप में उत्तर

उत्तर

Some of the reasons can be

  1. The screen is far away from the ball.
  2. The beam of light from the torch is falling parallel to the screen on the ball.
  3. The torch is kept away from the ball.
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अध्याय 11: Light - Long Answer Questions [पृष्ठ ७१]

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एनसीईआरटी एक्झांप्लर Science [English] Class 6
अध्याय 11 Light
Long Answer Questions | Q 23. | पृष्ठ ७१

संबंधित प्रश्न

Fill in the blank.

The darkest portion of a shadow is called the ................


Select the correct alternative.

Penumbra 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?


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.


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 is shadow? 


What is penumbra?


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?


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          

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.


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


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