Question

u=-25cm, v=-150cm, f=?​

Answer 1

Step-by-step explanation:

We know

u=-25cm

v=-150cm

f=?

1/f=-1/u+1/v

1/f=1/25-1/150

1/f=(150-25)/3750

1/f=125/3750

1/f=1/30

f=30