Question

An object is placed at a distance of 40 cm in front of a convex mirror of focal
length 10 cm. Find the magnification.​

Answer 1

Answer:

Object distance, u=−40cm

Focal length, f=−20cm

According to mirror formula,

u

1

+

v

1

=

f

1

or

v

1

=

f

1

−

u

1

or

v

1

+

−20

1

−

(−40)

1

=

−20

1

+

40

1

v

1

=

40

−2+1

=−

40

1

orv=−40cm

Negative sign shows that image is infront of concave mirror.

The image is real.

Magnification, m=

u

−v

=−

(−40)

(−40)

=−1

The image is of the same size and inverted.

solution