Question

4. An object of height 3 cm is placed at 9 cm from
a concave mirror. The height of its real image
is 9 cm. Find the image distance and the
radius of curvature of the mirror.
(Ans. U= - 27 cm, R= - 13.5 cm)
​

Answer 1

Explanation:

m=h2/h1

m=9/3=3

m=-v/u

u=-9cm

v=27cm

R=2f

1/f=1/u+1/v

f=-6.75

R=-13.5