Question

Hi!!!!!!
plz plz answer any one.......

Answer 1

Answers:

Q4:
O (height of object) =2cm
f (focal length) =20 cm(positive)
u =12cm (negative)

Using lens formula 1/v-1/u=1/f

1/v=1/f+1/u
1/v=1/20+(-1/12)
1/v=3-5/60
1/v=-1/30
v=30cm(negative)

I/O=v/u
-I/-2=-30/-12
I=30x2/12
I=5cm
Height of image is 5 cm

Magnification=I/O
Magnification=5/2
Magnification=2.5cm