Which sign convention do we want to use for referring focal length and radius of curvature in spherical lens(for both concave and convex lens)?
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actually take positive axis where from the might is coming.. simple rule.. is applied
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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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