Question

Please do answer this ques with correct explanation and steps

Answer 1

Hi!!

Given,

f  = +40 cm ( + sign indicates that the lens is convex )

h = h'

h = 2f  also,

h' = 2f

So, the distance between object and the image is,

2f + 2f = 4f

Substituting the value of f,

4f = 4×40

   = 160 cm