Question

pls quickly anser this

Answer 1

u= -40
let
h=x
h'=2x
according to mirror formula
h'/h= -v/u
2x/x= -v/40
by cross multiplication
-40x = 2x-v
v= 2x +40x
v=42x..

Answer 2

Answer is R=-40cm
F=-20cm

Hope helps you