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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 
 

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Grade:12

1 Answers

Deepak Kumar Shringi
askIITians Faculty 4404 Points
5 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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