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Large number of thin strips of black paint are made on the surface of a convex lens of focal length 20 cm to catch the image of a white horse. The image will be
- a)a horse of less brightness
- b)a zebra of black stripes
- c)a horse of black stripes
- d)More than one of the above
- e)None of the above
Correct answer is option 'A'. Can you explain this answer?
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Most Upvoted Answer
Large number of thin strips of black paint are made on the surface of ...
The correct answer is option 'A', which states that the image formed by the convex lens with a large number of thin black strips on its surface will be a horse of less brightness.
Explanation:
When light passes through a convex lens, it converges or comes together at a focal point. In this case, the convex lens has a focal length of 20 cm.
When the lens has a large number of thin black strips on its surface, these strips will block or absorb some of the incident light. As a result, less light will reach the focal point and form the image.
The image formed by the lens will be a real image, which means it can be projected onto a screen. However, the image will appear dimmer or less bright compared to the original object. This is because the black strips on the lens surface block a significant portion of the light that would have otherwise contributed to the brightness of the image.
The black strips effectively reduce the amount of light reaching the image, resulting in a decrease in brightness. Therefore, the image of the white horse formed by the lens with black strips will be a horse of less brightness.
It is important to note that the other options mentioned in the question are not correct:
- Option 'B' states that the image will be a zebra of black stripes. This is incorrect because the black strips on the lens surface do not change the nature or color of the object being imaged. The original object is a white horse, and the lens will form an image of a white horse, albeit with reduced brightness.
- Option 'C' states that the image will be a horse of black stripes. This is also incorrect because the lens does not introduce any additional black stripes to the image. The black strips on the lens surface only reduce the brightness of the image, but they do not create new stripes.
- Option 'D' states that more than one of the above options is correct. This is incorrect because only option 'A' is correct. The image formed by the lens with black strips will be a horse of less brightness, and none of the other options are applicable.
- Option 'E' states that none of the above options are correct. This is also incorrect because option 'A' is indeed correct. The image formed by the lens with black strips will be a horse of less brightness.
Explanation:
When light passes through a convex lens, it converges or comes together at a focal point. In this case, the convex lens has a focal length of 20 cm.
When the lens has a large number of thin black strips on its surface, these strips will block or absorb some of the incident light. As a result, less light will reach the focal point and form the image.
The image formed by the lens will be a real image, which means it can be projected onto a screen. However, the image will appear dimmer or less bright compared to the original object. This is because the black strips on the lens surface block a significant portion of the light that would have otherwise contributed to the brightness of the image.
The black strips effectively reduce the amount of light reaching the image, resulting in a decrease in brightness. Therefore, the image of the white horse formed by the lens with black strips will be a horse of less brightness.
It is important to note that the other options mentioned in the question are not correct:
- Option 'B' states that the image will be a zebra of black stripes. This is incorrect because the black strips on the lens surface do not change the nature or color of the object being imaged. The original object is a white horse, and the lens will form an image of a white horse, albeit with reduced brightness.
- Option 'C' states that the image will be a horse of black stripes. This is also incorrect because the lens does not introduce any additional black stripes to the image. The black strips on the lens surface only reduce the brightness of the image, but they do not create new stripes.
- Option 'D' states that more than one of the above options is correct. This is incorrect because only option 'A' is correct. The image formed by the lens with black strips will be a horse of less brightness, and none of the other options are applicable.
- Option 'E' states that none of the above options are correct. This is also incorrect because option 'A' is indeed correct. The image formed by the lens with black strips will be a horse of less brightness.
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Community Answer
Large number of thin strips of black paint are made on the surface of ...
The correct answer is a horse of less brightness.
Key Points
- An image of a white horse is captured by the convex lens.
- Since the light falling on the curved portion won't react at the picture point, the white horse's entire image is produced, but its intensity is reduced.
- A horse of less brightness is produced by the lens.
Convex Lens:
- The convex lens is relatively thick in the center and thin at the lower and higher borders.
- It converges light rays that travel parallel to its principal axis.
- Instead of curving inside, the edges are curled outward.
Concave Lens:
- A concave lens has thicker edges and a thinner center.
- It is one that bends a straight light beam away from the source and focuses it into a distorted, upright virtual image.
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Large number of thin strips of black paint are made on the surface of a convex lens of focal length 20 cm to catch the image of a white horse. The image will bea)a horse of less brightnessb)a zebra of black stripesc)a horse of black stripesd)More than one of the abovee)None of the aboveCorrect answer is option 'A'. Can you explain this answer?
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