Question

if an object is placed at a distance of 15 cm in front of a convex lens and the image is formed at a distance of 30 cm behind the lens . Then what will be it's focus?​

Answer 1

Explanation:

u=15

v=30

1/f=1/v-1/u

1/f=1/+30-1/-15

1/f=1/10

f=10