Question

f=+20cm , u =-2.5cm , h =2cm
then find the image distance and height of image​

Answer 1

Answer:

Height of object, h

o

=5cm, object distance u=−30cm, focal length f=−20cm

Now, from mirror formula :

f

1

=

v

1

+

u

1

v

1

=

f

1

−

u

1

=

20

−1

+

30

1

=−

60

1

v=−60cm - image distance

Magnification, m=−

u

v

=−

−30

−60

=−2

Size of image, h

i

=m(h

o

)=−2(5)=−10 cm

Answer 2

Answer:

given

f=20

u=-2.5

h=2

v=?

solution

1/f=1/u+1/v

1/20−1/−2.5=1/v

1/v=0.45

1=0.45×v

1/0.45=v

v=2.2222222222222

The image distance is 2.2222222222222cm

height of image is given h =2cm

I think my answer is wrong