To find the image-distance for varying object-distances in case o fa convex lens, a student obtains on a screen a sharp image of a bright object places very far from the lens.After that he gradually moves the object towards the lens and each time focuses its image on the screen. (a) In which direction-towards or away from the lens, does he move the screen to focus the object ? (b) What happens to the size of image - does it increase or decrease? (c ) What happen when he moves the objectvery close to the lens ?

To find the image-distance for varying object-distances in case o fa c

1.	To find the image-distance for varying object-distances in case o fa convex lens, a student obtains on a screen a sharp image of a bright object places very far from the lens.After that he gradually moves the object towards the lens and each time focuses its image on the screen. (a) In which direction-towards or away from the lens, does he move the screen to focus the object ? (b) What happens to the size of image - does it increase or decrease? (c ) What happen when he moves the objectvery close to the lens ?
Answer» Solution :(a) He MOVES the SCREEN away from lens to focus the object. (B) The size of the image increases. (c ) When the object is places very close to the lens, then image will be formed on the screen. As now image formed is ERECT and VIRTUAL.