Question

10. When an object of height 10 cm is placed at
6 cm from a concave mirror, its image is
obtained at 24 cm behind the mirror. Find the
magnification produced by the mirror and the
height of the image.(Ans. M=4, h, = 40 cm)​

Answer 1

Explanation:

Object distance u=−36 cm

Focal length of concave mirror f=−12 cm

Using mirror formula :

v

1

+

u

1

=

f

1

Or

v

1

+

−36

1

=

−12

1

⟹ v=−18 cm

Magnification

h

o

h

i

=

u

−v

Or

10

h

i

=

−10

−(−18)

⟹ h

i

=−18 cm

Image formed is real and inverted.