An object is placed infront of a lens. If we cover the middle part of the lens, the intensity of the image formed will decrease.

True

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False

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Solution

The correct option is A
True

When a part of the lens is covered, image with same nature will be formed at the same place by the light rays passing from the top and bottom of the lens. The rays that were passing earlier through the covered region are not passing now, so the intensity of the image will be reduced.

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Similar questions

If we cover a part of the lens then the intensity of the image formed of an object placed in front of the lens will decrease.

Q. An object is placed infront of a lens and a part of the lens is covered, then the intensity of the image formed by the lens will .

Q. A converging lens is used to form an image on a screen. When the upper half of the lens is covered by an opaque screen.
a) Half of the image will disappear
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c) Intensity of the image will increase
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Q. One half of a lens is covered with a black paper.
(a) Will this lens produce a complete image of an object?
(b) Is there any change in the intensity of the image?
(c) Draw a diagram to show the formation of the image by this lens.
(d) What will happen if we remove the black paper?
[5 MARKS]

The centre of curvature of a convex lens is at $40 c m$ and its central portion is wrapped in black paper as shown below. If an object is placed at $90 c m$ , find the nature of image formed.

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