A student obtained a sharp image of a lighted candle on a screen using a convex lens. Now he wants to focus a distant lamp on a far away electric pole. In which direction should the lens be moved for this purpose with respect to the screen, to get a sharp image on the screen? Justify your answer.

To focus a distant object (like a lamp on a faraway electric pole) using a convex lens, the lens needs to be moved away from the screen. This is because a convex lens converges parallel rays of light to a point called the focal point. For distant objects, the incoming light rays can be considered as nearly parallel.

Here’s a step-by-step explanation:
1) Converging Property: A convex lens has the property of converging parallel rays of light. When the lens is closer to the screen, the incoming rays from the distant object will converge too early, and you won’t get a sharp image on the screen.
2) Focal Point Adjustment: By moving the convex lens away from the screen, you are effectively adjusting the focal point of the lens for the distant object. The lens needs to be positioned in such a way that the parallel rays converge exactly at the location of the screen.
3) Sharp Image Formation: The goal is to ensure that the rays from the distant object converge to a sharp image on the screen. This is achieved by adjusting the lens position.

In summary, to focus a distant lamp on a faraway electric pole, move the convex lens towards the screen. As the distance of object increased, the image formed by a convex lens will be more close to the focus.

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