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| 1. |
What happens if the optic centre of a lease is closed by black paper? |
| Answer» when one-half of the lens is covered with a black paper, the complete image of the object will be formed. Take a convex lens and focus the light from a distant object onto a screen. As expected, an image (sharp) is formed at a distance equal to the focal length Cover the lower or the upper half of the lens and focus the light from the same object onto the same screen. You will be able to get a sharp image again; however, the brightness of the image will be less in the second case. The same effect will be seen even if the lens is half covered with black stripes. | |