Question

v = 10cm
f = 20cm
u= ?
¹/f = ¹/u +¹/ v
¹/u = ¹/f - ¹/v = v - f / v*f
find ' U ' ?​

Answer 1

Explanation:

u=v*f / v-f

u=10*20 / 10-20

u= 200/-10

u= -20cm