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You can listen to your friend round a corner, but you cannot watch him/her. Why?



Q: You can listen to your friend round a corner, but you cannot watch him/her. Why?
Ans: The sound waves have larger wavelength than light waves. These are diffracted by the corner of wall and light waves cannot do so, due to their very small wavelength (as compared with size of wall corner). So, without seeing the friends his/her voice can be heard.

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