Question

an object is placed at 30cm infront of convex lens. focal length is 10cm.at what distance image is formed from lens​

Answer 1

Answer:

7.5cm

Explanation:

u= -30cm

f= -10cm

from lens formula

1/v - 1/u = 1/f

1/v = -1/30 -1/10

       -4/30

v =  -30/4

  = 7.5cm