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The focal length of a less is given by t...

The focal length of a less is given by the formula `(1)/(f)=(1)/(u)+(1)/(v)`. Make f as the subject of the formula.
if `u=20cm` and v=30, then find f.
The following steps are involved in solving the above problem. Arrange them in sequential order.
(A) Given `(1)/(f)=(1)/(u)+(1)/(v)`
(B) `rArr f=(uv)/(u+v)`
(C) `f=(20xx30)/(20+30)=(600)/(50)=12`cm.
(D) `rArr (1)/(f)=(v+u)/(uv)`

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