(a) A lens forms a blurred image of an object on the screen as shown below:
What changes can you make to the following to form a sharp and in-focus image on the screen?
(i) object distance
(ii) focal length of the lens
Answer:
(a)
From the diagram we can tell that the object is not at infinity, neither at the focus.
It can either be at C, between C and F, or between F and O.
This can be achieved in two ways:
(i) decrease the object distance
(ii) increase the focal length