Question

An object is placed at a distance of 60 cm from a concave lens of focal length 30 cm.

i) Use the lens formula to find the distance of the image from the lens​

Answer 1

Answer:

60 cm...............

Answer 2

Answer:

20cm

Step-by-step explanation:

Given - object distance(u) = -60cm

             focal length(f) = -30cm

Solution - 1/v - 1/u = 1/f

                1/v - 1/(-60) = 1/(-30)

                1/v = -1/60-1/30 = -3/60=-1/20

v = -20cm meaning image is formed 20cm in front of the lens