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In a 10 m high room a partition of heigh...

In a 10 m high room a partition of height 7m separates two students on either side. Both light and sound waves can deviate from their path if they experience any obstruction. Then why is it that the two students can converse with each other even if one cannot see the other?

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The size of partition is very large as compared to the wavelength of light and hence it is not diffracted and both students cannot see each other. The wavelength of sound waves is of the order of height of partition. It causes sound to diffraction and they can converse with each other.
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