When does a shadow form? - Science

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When does a shadow form?



Shadow is formed when light does not reach behind the opaque object kept in the path of light.

Concept: Shadow
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Fill in the blank.

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

Fill in the blank.

The less dark portion of a shadow is called the .................

Select the correct alternative.

Umbra is a region of

What is a shadow? Give a reason for its formation.

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?

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 a penumbra on the screen.

State the conditions when only the penumbra of an opaque object is obtained on the screen.

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?

Sivarajan placed a meter stick in the playground at 7.00 am in the morning. How will the shadow of the stick at noon look in comparison to the one in the morning

What are the parts of 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          

______ is always against, opposite side of light source.

The ______ is the darkest part of a shadow.

The lighter shade of shadow is the ______.

Which of the following can never form a circular shadow?

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.

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.

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.


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