The focal length of a mirror is give by (1)/(f)=(1)/(u)+(1)/(v), where 'u' represents object distance, 'v' image distance and 'f' local length. The maximum relative error is

The focal length of a mirror is give by (1)/(f)=(1)/(u)+(1)/(v), where

1.	The focal length of a mirror is give by (1)/(f)=(1)/(u)+(1)/(v), where 'u' represents object distance, 'v' image distance and 'f' local length. The maximum relative error is
Answer» `(DELTA f)/(f)=(Delta u)/(u)+(Delta v)/(v)` `-(df)/(f^(2))=(-(du)/(u^(2)))+(-(DV)/(v^(2)))` `(Delta f)/(f)=(Delta u)/(u)+(Delta v)/(v)+(Delta(u+v))/(u+v)` `(Delta f)/(f)=(Delta u)/(u)+(Delta v)/(v)+(Delta u)/(u+v)+(Delta v)/(u+v)` Answer :B::C