Question

tell me the answer I will make you brainlist​

Answer 1

Answer:

f = 0.15 and hi=5

Explanation:

1/v-1/u=1/f

1/20-1/-10=1/f

f=0.15

m=hi/ho=v/u

hi/2.5=20/-10

hi/2.5=-2

hi=5