Question

How far from a converging lens with a focal length of 47 cm should an object be placed to produce a real image which is the same size as the object? 2 sig f

Answer 1

SOLUTION :

For same size image object should be at radius of curvature.

== > i.e. 2f

We have ,

   == >  f = 47 cm

Then ,

== > 2 f

== > 2 * 47

== > 94 cm