Question

find the sum of the following question​

Answer 1

mirror formula

1/v+1/u=1/f

u=-15, f=-5

1/v=1/-5 +1/15

=-3/15 + 1/15 =-2/15

v=15/-2 = -7.5

m=-v/u

=-7.5/-15=1/2

=0.5D

nature is real and inverted