Question

draw a diagram and apply the sign convention in the determination of the focal length of a spherical mirror of which forms a three times magnified real image of an object placed 16 cm in front of it

Answer 1

Magnification = -3

u= -16

f=?

m=-v/u

-3=-v/-16

v=-3×16

= -48cm

1/f=1/u+1/v

=(-1/16)+(-1/48)

-1/16-1/48

By taking LCM,

= -3-1/48

-4/48

1/f=-1/12

f= -12