Question

The image formed by a spherical mirror is real inverted and is of magnification -2. The image is formed at a distance of 30cm from the mirror. Where is the object placed ? Find the focal length of the mirror and.

Answer 1

this is the answer
the spherical is concave mirror

Answer 2

Answer:

Given :

Magnification m = - 2

Image distance v = 30 cm

We know :

m = - v / u

- 2 =  - (- 30 ) / u

u = - 15 cm

We have mirror formula :

1 / f = 1 / v + 1 / u

1 / f = 1 / - 15 - 1 / 30

1 / f = - 1 / 10

f = - 10 cm

Therefore focal length is 10 cm.