Question

Two point form formula

Answer 1

1/f=1u+1/v where f-focal length ,u-distance of object from mirror ,v-distance of image from mirror

Answer 2

two point formula of a st.line

let the two points be (x1,y1) and (x2,y2) then the st.line will be

y-y1= (y2-y1/x2-x1) (x-x1)

hope u need this and helps u

thanks for asking doubt