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प्रश्न
In the following diagram, draw rays to form umbra on the screen.
उत्तर
A’B’ – umbra
Umbra alone is obtained on the screen when the opaque object is illuminated by a point source of light.
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संबंधित प्रश्न
Fill in the blank.
The darkest portion of a shadow is called the ................
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.
Why is it that the birds flying in the sky do not cast their shadow on the earth?
Answer the following.
How is a shadow formed? Write the conditions required for a shadow to form.
What is shadow?
What is penumbra?
When does a shadow form?
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 properties 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 |
______ is always against, opposite side of light source.
The ______ is the darkest part of a shadow.
Which of the following can never form a circular shadow?
A torch is placed at two different positions A and B, one by one, as shown in Fig. 11.9.
The shape of the shadow obtained in two positions is shown in Fig. 11.10
Match the position of the torch and shape of the shadow of the ball.
