Question

focal length of a convex mirror is 40 cm if the vartual
image of am object is at 30 cm distance then find the distance of objects and magnefiction

​

Answer 1

Answer:

Here, f = -30 cm, u = -40 cm

Image distance can be calculated as follows :

v

1

+

u

1

=

f

1

or,

v

1

−

40

1

=−

30

1

or,

v

1

=−

30

1

+

40

1

=

120

−4+3

=−

120

1

or, v=−120 cm

Magnification can be calculated as follows :

M=

u

v

=

−40

−120

=3

The positive sign with magnification show that image is real.