Question

A student focuses the image of a well-illuminated distant object on a screen using a convex lens. After that he gradually moves the object towards the lens and each time focuses its image on the screen by adjusting the lens. (i) In which direction-towards the screen or away from the screen, does he move the lens? (ii) What happens to the size of the image-does it decrease or increase? (iii) What happens to the image on the screen when he moves the object very close to the lens?

Answer 1

A student focuses the image of a well-illuminated distant object on a screen using a convex lens. After that he gradually moves the object towards the lens and each time focuses its image on the screen by adjusting the lens.

(i) He should move the lens away from the screen as he needs to increase the distance between screen and lens.

(ii) the size of the image decreases

Iii) the image on the screen will disappear when he moves the object very close to the lens.

Answer 2

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A student focuses the image of a well-illuminated distant object on a screen using a convex lens. After that he gradually moves the object towards the lens and each time focuses its image on the screen by adjusting the lens.

(i) He should move the lens away from the screen as he needs to increase the distance between screen and lens.

(ii) the size of the image decreases

Iii) the image on the screen will disappear when he moves the object very close to the lens.

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