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Did not understood the last calculation and last sign convention .. plz explain me sir

Did not understood the last calculation and last sign convention .. plz explain me sir 
 

Question Image
Grade:12

1 Answers

Deepak Kumar Shringi
askIITians Faculty 4405 Points
3 years ago
1/v=1/15+1/60
=5/60
=1/12
so v=12
as its is positive it will be left side of mirror

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