A 4 cm tall object is placed on the principal axis of convex lens. The distance of the object from the optical centre of the lens is 12 cm and its sharp image is formed at a distance of 24 cm from it on a screen on the other side of the lens. If the object is now moved a little away from the lens, in which way (towards the lens or away from the lens) will he have to move the screen to get a sharp image of the object on it again ? How will the magnification of the image be affected?

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Solution

The screen has to be moved towards the lens in order to focus the sharp image of the object. The image size will decrease.

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Similar questions

To find the image-distance for varying object-distances in case of a convex lens, a student obtains on a screen a sharp image of a bright object placed very far from the lens. After that he gradually moves the object towards the lens and each time focuses its image of the screen.

(a) In which direction - towards or away from the lens, does he move the screen to focus the object?

(b) What happens to the size of image - does it increase or decrease?

Q. A convex lens forms an image of an object placed