Question 21

The distance between an object and a convex lens is changing. It is noticed that the size of the image formed on a screen is decreasing. Is the object moving in a direction towards the lens or away from it?

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Solution

In case of a convex lens- when we move the object away from the lens, the size of the image decreases. Ultimately, when an object is at an infinite distance an image is formed at the focus of the lens.

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Q. The distance between an object and a convex lens is changing, and it is noticed that the size of the image formed on a screen is decreasing. Is the object moving in a direction towards the lens or away from it?

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 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?

Q. A