Question

At what distance from a convex mirror of focal length 20 cm should an object should be placed so that it's image is half of it's height ​

Answer 1

Given, f=20cm,u=−20cm,v=?

As,

f

1

=

v

1

+

u

1

v

1

=

f

1

−

u

1

v

1

=

20

1

+

20

1

v

1

=

20

2

so , v=10