Question

If a concave mirror have focal length of 20 cm and the image formed by the mirror at the distance of 40 cm.Find the position of the object?

Answer 1

Answer:

ANSWER

The focal length of the mirror is 20cm.

In the case of real image,

The object distance is u

1

, then the image distance will be −2u

1

.

The mirror formula is given as,

v

1

+

u

1

=

f

1

−2u

1

1

−

u

1

1

=

20

−1

u

1

=30cm

In the case of virtual image,

The object distance is −u

2

, then the image distance will be 2u

2

.

The mirror formula is given as,

v

1

+

u

1

=

f

1

2u

1

1

+

−u

1

1

=

20

−1

u

2

=10cm

The distance between two positions of object is given as,

u=30−10

=20cm

Thus the distance between the two positions of object is 20cm.

Answer 2

Answer:

ans is 20cm. So pls mark it as brainliest