Question

Using a convex lens, a clear image of candle flame is produced on a screen. How many other clear images can be received on this screen if only the lens is to be shifted ?

Answer 1

Two or more clear images can be received on this screen if only the lens is to be shifted.

• When the object is between the pole and the focus, when the object is between F and 2F, and when the object is at 2F, the convex lens gives an enlarged and clear image of the item.
• When the object is in focus, the lens generates a magnified picture as well, but the image is substantially magnified in this case, making the image less clear.
• As a result, if the lens is shifted, the convex lens can produce two additional distinct images of the candle, ignoring the image development of the candle before the lens changes.