A positive lens with a focal length of 10 cm forms a real image of an object 20 am away
from the lens. How far is the real image from the lens?
a. 5 cm
b. 10 cm
c. 15 cm
d. 20 cm
from the lens. How far is the real image from the lens?
a. 5 cm
b. 10 cm
c. 15 cm
d. 20 cm