Physics, asked by Akash820, 1 year ago

plz tell me the formulas of concave and convex mirrors and lens with signs + or -

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Answered by Aravinthan31
1
i think this will be help full
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Akash820: lens
Answered by Anonymous
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                         Note :


  • f = focal length
  • v = distance of image .
  • u = distance of object .

Lens formula :

1 / f = 1 / v - 1 / u


Concave lens :


f = negative

u = negative

v =  negative


Convex lens


f = positive

u = negative

v = positive for real image ,

v = negative for virtual image .


The optical centre is chosen as the origin of the coordinate system.


With respect to optical centre :

The part which are above are positive, below negative.

The part which are right are positive while left is negative.

This is just like the normal x-axis and y-axis in the co-ordinate system .

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