A real image of a candle formed with a converging lens can be viewed on a screen placed
A) nowhere; that is, it can't be viewed on a screen at all.
B) at either focal point of the lens.
C) anywhere on the side of the lens from which the light emerges.
D) at a single position determined by the distance of the object and the construction of the lens.

Question

Quizplus · Accepted Answer

A real image formed by a converging lens can be viewed on a screen placed at a single position, which is determined by the distance of the object and the construction of the lens. This position is the point where the light rays converge after passing through the lens. This point can be found using the lens equation (1/f = 1/do + 1/di), where f is the focal length of the lens, do is the distance of the object from the lens and di is the distance of the image from the lens. Once this point is determined, a screen can be placed at that position to view the real image of the candle. Choice A is incorrect because a real image can be viewed on a screen. Choice B is incorrect because a real image is not formed at the focal point of a converging lens. Choice C is incorrect because the position of the image is not dependent on the side of the lens from which the light emerges.

A Real Image of a Candle Formed with a Converging