# ^Newton’s formula

^**Newton’s formula**

Let x_{1 }& x_{2 }respectively be the distance of object & image from focus instead of from the pole of a mirror or lens, then x_{1 }x_{2 }= f^{2}.

^**Newton’s formula**

Let x_{1 }& x_{2 }respectively be the distance of object & image from focus instead of from the pole of a mirror or lens, then x_{1 }x_{2 }= f^{2}.