7 Replies
@Gyro Gearloose
Note for OP
+solved @user1 @user2... to close the thread when your doubt is solved. Mention the users who helped you solve the doubt. This will be added to their stats.lens formula? actual vs theoretical, get error?
Ok but could you please solve it?
😿pen pencil nahi hai par sunle
First apply lens formula normally and calculate the parameter not given
Then differential the whole equation
It would become
(-dv/v²+du/u²)=-df/f²
But error is always calculated at its maximum value
So you get (dv/v²+du/u²)=df/f²
For error in focal length
(dv/v² + du/u²)f = df/f
du=dv = least count of scale
Thanks dude I understood it🙂
+solved @Dexter
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