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Question

Hi,

May I know how to explain why the answer is option 2? Thanks!

Answer

Both the square and the circle does not allow light to pass through whereas the triangle allows some light to pass through. Based on this, we can conclude that the only possible way(s) to get a shadow of a triangle to be cast on the screen is for the triangle to be in position A, where it will be closest to the light source and thus cast the shadow of a large triangle on the screen.

If the triangle was at B or C, the shape (either the square or the circle) in front of it will simply block the incoming light from reaching the triangle. Therefore, a small triangle can never be cast on the screen.

Position A Position B Position C Result
Square Circle Triangle Shadow of a large square
Square Triangle Circle Shadow of a large square
Circle Square Triangle Shadow of a large circle
Circle Triangle Square Shadow of a large circle
Triangle Square Circle Shadow of a large triangle with a darker shadow of a square in the middle
Triangle Circle Square Shadow of a large triangle with a darker shadow of a circle in the middle

 

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