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24/09/2021 8:49 pm
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One-half of a convex lens is covered with a black paper. Will this lens produce a complete image of the object? Verify your answer experimentally. Explain your observation.
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24/09/2021 8:50 pm
Yes, it will produce a complete image of the object. This can be verified experimentally as follows:
Procedure:
- Take a metre scale and place it horizontally against a white or light coloured wall with 0 cm end touching the wall.
- Take a convex lens and focus the light from a distant object, say a tree, by moving the lens to and fro along the metre scale.
- A sharp image of the tree is formed on the wall at a distance equal to the focal length of the lens.
- Cover lower or upper half of the lens with black paper.
- Again focus the light from the same tree on the wall. A less bright image of the tree is formed on the wall from the same point on the metre scale.
Observation: It is observed that when half of the lens is covered, its focal length remains the same. Only the intensity of light entering the lens decreases due to which the brightness of the image also decreases.
Diagrammatically, it can be represented as