by Tiwari Academy
Covering one-half of a convex lens with black paper does not prevent it from forming a complete image of an object. The uncovered half still converges light rays to form an image. However, the image’s brightness and sharpness may be reduced due to the decreased amount of light being focused. Experimentally, this can be observed by shining light through the lens onto a screen. The complete, albeit dimmer, image will still be formed.
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Introduction to Lens Functionality
Basic Principles of Lenses: A lens, such as a convex lens, works by refracting light rays to converge at a point, forming an image. The entire surface of the lens contributes to this process, bending light rays from different parts of the object.
Experiment Setup
Testing Image Formation: To experimentally verify the effect of covering half of a convex lens with black paper, one can set up a simple experiment. Place an object in front of the lens and project its image onto a screen, first with the entire lens exposed and then with half covered.
Observing with an Uncovered Lens
Full Lens Functionality: Initially, with the entire lens exposed, the lens will form a complete and bright image on the screen. This is due to the full surface of the lens participating in bending the light rays from the object.
Covering Half of the Lens
Partial Light Passage: When one-half of the lens is covered with black paper, only half of the lens is available to refract light. This setup tests whether the uncovered portion of the lens is capable of forming a complete image.
Observations from the Experiment
Image Formation with Partial Lens: Despite half of the lens being covered, a complete image of the object is still formed on the screen. However, this image may appear less bright and less sharp compared to when the entire lens is used, due to the reduced amount of light being focused.
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Understanding Lens Image Formation: This experiment demonstrates that a convex lens can still form a complete image even when partially obstructed. It highlights the principle that each part of a lens can independently contribute to image formation, although the quality of the image is affected by the extent of the lens’s exposure to light.
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