Science activity John was making a shadow-puppet theater. He used a sheet stretched between two table legs as his screen and a bright lamp as his light source. He made the shape of a person from cardboard and stuck it on a stick, but the shadow of the shape was too big for the screen. How could he make the shadow smaller? Describe two ways.
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shadow
*
screen
light source
opaque object
a. What will happen to the shadow if a stronger light source is used?
b. State two ways to increase the size of the shadow.
c. What will happen to the colour of the shadow if a piece of blue cellophane
paper is placed between the light source and the object? Explain.
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