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

Answer:

1 more

Explanation:

clear image means that the image should be

1)caught on screen

here four extra images can be caught on screen but however 1 of them is highly enlarged and other is highly diminished and other is diminished.

so remaining is 1 (that is at 2f or between f and 2f)

Answer 2

Two or more clear images are to be found only if the lens is shifted.

• Convex Lens: It is a type of lens where the edges of these lens are thin compared to the center of the lens.
• When the image passes through the center of the lens, the image tends to converge.
• we get one real and clear image initially.
• When the lens shifted a bit the distance and position changes and we get two or more images also depending on the position and distance of the candle flame.