Question

During an experiment of formation of image using concave mirror

Position of mirror =10 cm

Position of candle =50 cm

Position of screen =90 cm

Find the focal length of mirror and draw the ray diagram using these distance by assuming suitable

scale .​

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.