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Questions on Light

Q3. Shadow puppets are sometimes used in children's shows.

(a) Where will the shadow of the puppet's foot be on the screen? Position A, B, C or D?

C

See the diagram for how to work this out.

1 mark

(b) How is the shadow of the puppet formed?

Light does not bend round the puppet and light cannot go through the puppet. Light travels in straight lines.

1 mark

(c) When the light is turned on, the shadow and the brightly lit part of the screen can be seen immediately. What does this tell you about the speed of light?

It is very high.

1 mark

Maximum 3 marks