Question

the image of an object placed 16 cm from a concave mirror is formed at a distance of 24 cm from the mirror find its focal length of the concave mirror​

Answer 1

Answer:

9.6 cm

Explanation:

1/f = 1/x + 1/y

1/f = 1/16 + 1/24

1/f = 40/(16x24) = 5/48

f = 48/5 = 9.6 cm

Answer 2

Answer:

48 cm .

Explanation:

Image distance ( v ) = 24 cm

Object distance ( u ) = 16 cm .

We have to find focal length ( f) :

We have mirror formula :

1 / f = 1 / v + 1 / u

Putting values here we get :

1 / f = 1 / 24 + 1 / - 16   [ u always considered in negative sign ]

1 / f = 2 - 3 / 48

1 / f = - 1 / 48

f = 48 cm  [ Negative sign show only direction here ]

Thus focal length of mirror is 48 cm .