Draw and complete the following diagrams to show what happens to the beams of light as they enter the glass block and then leave it:
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When a beam of light rays enters the glass block, it gets refracted. It bends towards the normal. Also, when these light rays leave the block, they bend away from the normal.
When light rays fall normally on the surface of the glass block, there is no bending of rays; the rays travel straight.
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