A student focuses the image 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. 
a)  In which direction - towards the screen or away from the screen, does he move the lens? 
b) What happens to the image on the screen when he moves the object very close to the lens? 

Asked by pdcavita | 19th Dec, 2017, 06:43: AM

Expert Answer:

a) He will move the lens away from the screen.
b) When an object is very close to the lens a virtual image is formed by the lens.

Answered by Gajendra | 19th Dec, 2017, 01:02: PM