Photograph is related to People. People is related to Majority. Majority is the opposite of Minority. 
Hear is related to Vision. Vision is related to Reflection. Mirror can be used for Reflection. 
Photograph <--RelatedTo--> People <--RelatedTo--> Majority <--Antonym--> Minority 
Hear <--RelatedTo--> Vision <--RelatedTo--> Reflection <--UsedFor-- Mirror 