Question

given : (h2) = 3cm
(u) = -30
(f) = 15 cm
To find :-
(v) = ?
(h1) =?​

Answer 1

Using mirror formula,

1/f=1/v + 1/u

v=10 cm

Using magnification,

h2/h1 = -v/u

h1=9 cm