Question

2. A concave lens of focal length 15 cm forms an image 10 cm from the lens. How far is the object placed from the lens? . pls answer fast.​

Answer 1

Answer:

object distance = 6 cm

Explanation:

given

focal length = 15cm

image distance = 10 cm

1/f=1/u+1/v

1/15=1/u+1/10

1/15+1/10=1/u

5/30=1/u

1/6=1/u

u=6cm