Question

If a real object is placed at a distance of x from the focus of a spherical mirror has its real image at y from the focus .The focal length of the mirror = ?

Answer 1

Answer:

xy/. x-y

Explanation:

u=x

v=y

1/u-¹/v =1/f

1/x. -1/ y =1\f

y-x. /xy=1/f

fy-fx = xy

f(x-y) = xy

f=. xy/ x-y