Question

An object is placed at 20cm from a concave mirror forms a real inverted image at a distance 40cm from the concave mirror.Find the focal length of the concave mirror.​

Answer 1

Explanation:

hey!

here's your answer,

u= (-20 cm)

v= (+40 cm)

f= ?

1/v + 1/u = 1/f

1/40 - 1/20 = 1/f

(1-2)/40 = 1/f

-1/40 = 1/f

f = -40 cm

hope it helps you