Question

who give correct answer i will phollow you pls fast i give you 20 points​

Answer 1

Answer:

Hope it helps uh mate✌✌

Mark me brainlist plz

Answer 2

Answer:

using mirror formula

1/v+ 1/u+1/f

1/v-1/20+1/40

1/v=1/30+1/40

1/v=-2+1/40

1/v=-1/40

v=-40cm