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.
- In which direction-towards the screen or away from the screen, does he move the lens?
- What happens to the size of the image-does it decrease or increase?
- What happens to the image on the screen when he moves the object very close to the lens?
CBSE DELHI - SET 1 2016
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- As the object is moved towards the lens, the image distance increases. Thus, the student moves the lens away from the screen to focus the image.
- The size of the image increases when the object is moved towards the lens.
- When the object is moved very close to the lens, no image is formed on the screen. A virtual image is formed behind the object on the same side of the screen
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