Question

A student focuses the images of a well illuminated distant object on a screen using a convex lens. After that he gradually moves the object towards the lens and each time focuses its image on the screen by adjusting the lens. 
(i) In which direction-towards the screen or away from the screen, does he move the lens ?
(ii) What happens to the size of the image-does it decrease or increase ?
(iii) What happens to the image on the screen when he moves the object very close to the lens ?

Answer 1

(i) Lens towards the screen/screen away from the lens
(Note: One mark to be awarded for any other answer)
(ii) Increase.
(iii) No image on the screen.