Question

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

Answer 1

Answer :-

Object distance = u = 30 cm

Focal length = f = 30cm

i. lens formula = 1/f = 1/v - 1/u

so = 1/v = 1/f + 1/u

= 1/30 + 1/30 = 2/30

v = 15 ( Ans )

Step-by-step explanation:

Check the above attachment also.