Question

please anyone provide Sign convention of V,u,f in mirror and lens

Answer 1

For mirror image
object distance, u= -ve
object height, h = +ve
***For real and inverted image
image distance, v = - ve
image height, h'= - ve
**** for virtual and erect image
image distance, v = + ve
image height ,h'= + ve

For Concave mirror, f =+ve
For Convex mirror, f = -ve

Hope it helps!!

Answer 2

                         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 .