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PS-16
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Primary Science Learning Experience
PS–16   The Light In Your Eyes
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TRY THIS
Place any block in a light beam. How are direction and beam width affected? Add other blocks one at a time, noting the beam changes after each addition. Change the blocks' arrangement. Where do the changes start?

WHAT IS HAPPENING
When light passes between different transparent media (eg: from air into acrylic), it changes direction at the interface (boundary) because different media have different refractive indices. At the interface, it is partially reflected and partially refracted-transmitted in a different direction. A flat interface usually reflects-refracts light. A curved interface converge/diverge light as well. The inside of our eyes is made up of several curved interfaces. Do you see how light is redirected and reshaped before it reaches the retina in the back of our eyes? Can you simulate this with the blocks?
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