Question

12.
If focal length (f) is 20 cm and object distance (u) is 30 cm is placed on the principal
axis of convex lens then, What is the value of image distance (v)?​

Answer 1

Answer:

1/f=1/v-1/u

1/v=1/f+1/u

=1/20+1/30

=3+2/60

=5/60

then,

1/v=1/12