Question

One half a convex lens of focal length 20cm is covered with a black paper.
1.Will the lens produce a complete image of the object?
2.Show the formation of image of an object placed at 2F of such covered lens with help of a ray Diagram.
3.How will the intensity of the image formed by half-covered lens compare with non covered lens?

Answer 1

howdy!!

your answer is ---

1) A convex lens , one - half covered with a black paper , form a complete image of an object kept in front of it .

2) the formation of image at 2f is in the above figure ☝☝

3) when the lens is covered half with a black paper , the brightness of image formed is reduce because lesser number of light rays is allowed to pass through lens .



hope it help you

Answer 2

Answer:

THANKINGYOU

One half of the convex lens is covered with a black paper. Will the lens produce a complete image?

One half of the convex lens is covered with a black paper. Will the lens produce a complete image?

Yes but the area that the image covers will be smaller and dimmer. Consider that in a camera with an adjustable aperture, when the lens is stopped down, that is, the aperture is set to its smallest opening, the edges of the lens package will be occluded. The result in the image is, again, dimmer, but also has a deeper field of focus. Objects closer to and further from the camera are in sharper focus than with the lens wide open.

Gn(GoodmorniNG)

❤️

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