Question

the radius of curvature of a concave mirror forming a real image magnified twice when an object is placed 12 CM away from the pole is:
(a) 8cm
(b) 16cm
(c) 48cm
(d) 24cm​

Answer 1

Answer:

m=-2

m=-v/u

v=2u

by mirror's formula

1/u+1/v=1/f

1/u+1/v=2/R

1/u+1/2u=2/R

(3/2u)=2/R

(3/4×12)=1/R

1/16=1/R

R=16cm