Question

f=10
v=5cm
numerical
U=?
m=?​

Answer 1

1/f = 1/u + 1/v

1/10 = 1/u + 1/5

1/10-1/5 = 1/u

10-5/10 = 1/u

1/2 = 1/u

u = 2

M = -v/u

M= -5/2

M = -2.5

Answer 2

Apply this every answer is going to correct