Question

The focal length of converging lens is 10 cm. An object is kept at
30 cm from the centre of lens. Where will be the image be formed​

Answer 1

Answer:

1/10=1/v+1/30

1/v=1/10-1/30

1/v=30-1/30

v=30/29

Answer 2

Answer:

u=-30cm. v=? f=10

1/f=1/v-1/u. =1/10=1/v-1/-30

=1/v=1/10+1/30

=1/v=4/30

=1/v=2/15

=v=7.5cm

so the image is formed at a distance of7.5cm away from converging lens