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प्रश्न
Fill in the blank.
The darkest portion of a shadow is called the ................
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उत्तर
The darkest portion of a shadow is called the umbra.
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संबंधित प्रश्न
Select the correct alternative.
Penumbra is a region of
State two differences between an umbra and a penumbra.
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 umbra on the screen.
In the following diagram, draw rays to form a penumbra 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
Answer the following.
How is a shadow formed? Write the conditions required for a shadow to form.
What is shadow?
What is penumbra?
How does the colour of an opaque object affect the colour of the shadow?
What do we need in order to see a shadow?
______ is always against, opposite side of light source.
The lighter shade of shadow is the ______.
A torch is placed at two different positions A and B, one by one, as shown in the following figure.
The shape of the shadow obtained in two positions is shown in the following figure.
Match the position of the torch and shape of the shadow of the ball.
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.
