Question

0.
An object is placed at a distance of 30 cm in front of
a concaue mirror of focal length 20cm. Find the nature
and location of the image.​

Answer 1

Given, f=−20cm,u=−30cm,v=?

From equation,

v

1

+

u

1

=

f

1

v

1

+

−30

1

=

−20

1

or

v

1

=−

20

1

+

30

1

=

60

−3+2

=−

60

1

∴v=−60cm (real image)

∴ Magnification, m=−

u

v

=−

−30

−60

=−2

or m=−2