ANSWER: He doesn’t have to add anything as he prayed one single rakah with his imam and that was sufficient. If the imam prayed 3 rakah and he only caught one, he must stand up after salam of the imam and compete the remaining two. 

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ANSWER: This is not required at all. Allah has asked men to leave the beard and not touch it, He did not ask to grow it thick or long! Whatever comes naturally is sufficient.

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