Question

A concave lens of focal length 10cm forms a image 8cm from the lens . How far is the object placed from the lens ? calculate the magnification.​

Answer 1

Answer:

f=-10cm v=-8cm u=? m=?

Explanation:

1/f =1/v-1/u

1/u=1/v-1/f

1/u=1/-8-1/-10

1/u=1/-8+1/10

=-5+4/40

u=-40cm.

m=v/u

m=-8/-40

m=1/5.