Question

An object 2 cm in size is placed 30 cm in front of a concave mirror of focal length 15 cm

Answer 1

u = -30 cm

f = -15 cm

1/v - 1/u = 1/f

1/v = 1/u+1/f

v = uf/u+f

v= -30 x (-15) / -30-15    cm=  450/-45 cm = -10 cm

Height of image = v/u x height of object = 10/30 x 2 cm = 0.67 cm