A convex lens of a focal length 10cm is used to obtain a magnified image. if half part of thispainted black hoe does it affect of the intensity of lig

It seems like your question is incomplete. However, I can provide an answer based on what I understand from your question.

If half of a convex lens is painted black, it will affect the intensity of the light passing through the lens. This is because the black paint will absorb light, reducing the amount of light that can pass through the lens.

The lens works by refracting (bending) light rays that pass through it. If half of the lens is painted black, only half of the lens will be able to refract light. This means that the intensity of the light that comes out of the lens will be reduced.

In terms of the image formed by the lens, if the lens is used to form a magnified image, painting half of the lens black will likely affect the quality of the image. The image may be less bright and less clear, because less light is able to pass through the lens.

Here are the steps of how it happens:

1. Light rays from the object pass through the lens.
2. The convex lens refracts the light rays, causing them to converge at a point.
3. If half of the lens is painted black, only half of the light rays will be refracted.
4. This results in a reduction in the intensity of the light, and therefore a less bright and less clear image.

Please provide the complete question if you need a more specific answer.