Question

a student obtain a clear image of window bars on a screen with the help of convex lens.but in order to have the best image his teacher suggested him to obtain the image of a distant tree. where will lens has to be moved in order to obtain a clear image

1) away from the screen
2) behind the screen
3) towards the screen
4) at a very long distance from the screen

Answer 1

(a) toward the screen
because screen is just a device or an instrument where the image formed is to be observed. If the screen is removed, the lens will continue to form the image on its focus. Thus, on removing the screen and on looking through the lens in the direction of the object the image of the distant tree is inverted and formed at the focus.

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