What is the observation made by activity 10.9 in science class 10?
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When the a glass slab is placed over the line in such a way that one of its edges makes an angle with the line, then the line appears to be bent due to refraction of light. As light enters from the rarer medium(air) to the denser medium(glass), it is deviated from its path. Therefore the line appears to be bent. But when the glass slab is placed in such a way that it is normal to the line, then no bet can be observed as the incident ray falls normally(perpendicularly) to the surface of the glass slab and no bending of light takes place and it goes straight.
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