Question

sign convention of lens and mirror ??​

Answer 1

Answer:

Sign is taken as + (positive) behind the spherical mirror. For example if an image is formed behind the mirror, the distance of image is taken as + (positive) from pole along the principal axis. The height of is taken as + (positive) above the principal axis and taken as – (negative) below the principal axis.

In other words, if the image is on the far side of the lens as the object, the image distance is positive and the image is real. If the image and object are on the same side of the lens, the image distance is negative and the image is virtual. For converging mirrors, the focal length is positive

Answer 2

Answer:In concave mirror,

u,f = negative always

h= positive always

v,m,h'= positive in case of virtual image and negative in case of real image.

In convex mirror,

u=negative always

f,h,h',m,v= positive always

In convec lenns

,h,V,f=+

U=-

In concave lenSs u,v,f,=-