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A converging lens is used to form an image on a screen. When the upper half of the lens is covered by an opaque screen
- a)half of the image will disappear
- b)complete image will disappear
- c)intensity of image will decrease
- d)intensity of image will increase
Correct answer is option 'C'. Can you explain this answer?
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A converging lens is used to form an image on a screen. When the upper...
Image formed is complete but has decreased intensity.
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A converging lens is used to form an image on a screen. When the upper...
Explanation:
When the upper half of a converging lens is covered by an opaque screen, the behavior of the lens changes. Let's break down the explanation step by step:
1. Formation of the image:
When an object is placed in front of a converging lens, the lens refracts the light rays and forms an image on the other side of the lens. The image can be either real or virtual, depending on the position of the object.
2. The effect of covering the upper half of the lens:
When the upper half of the lens is covered by an opaque screen, it blocks the passage of light through that region. This means that only the lower half of the lens allows light to pass through.
3. The behavior of the lens:
The lower half of the lens continues to refract the light rays, forming an image on the other side. However, the upper half of the lens does not contribute to the formation of the image anymore as it is blocked by the screen.
4. Result of blocking the upper half of the lens:
As a result of blocking the upper half of the lens, the image formed on the screen will only be half of the original image. The upper half of the object will not be visible in the image because the light rays from that region are blocked by the screen.
5. The intensity of the image:
The intensity of an image refers to the brightness or the amount of light in the image. When the upper half of the lens is covered, the intensity of the image will decrease. This is because the blocked half of the lens reduces the amount of light passing through, resulting in a dimmer image on the screen.
Therefore, the correct answer is option 'C' - the intensity of the image will decrease when the upper half of the lens is covered by an opaque screen.
When the upper half of a converging lens is covered by an opaque screen, the behavior of the lens changes. Let's break down the explanation step by step:
1. Formation of the image:
When an object is placed in front of a converging lens, the lens refracts the light rays and forms an image on the other side of the lens. The image can be either real or virtual, depending on the position of the object.
2. The effect of covering the upper half of the lens:
When the upper half of the lens is covered by an opaque screen, it blocks the passage of light through that region. This means that only the lower half of the lens allows light to pass through.
3. The behavior of the lens:
The lower half of the lens continues to refract the light rays, forming an image on the other side. However, the upper half of the lens does not contribute to the formation of the image anymore as it is blocked by the screen.
4. Result of blocking the upper half of the lens:
As a result of blocking the upper half of the lens, the image formed on the screen will only be half of the original image. The upper half of the object will not be visible in the image because the light rays from that region are blocked by the screen.
5. The intensity of the image:
The intensity of an image refers to the brightness or the amount of light in the image. When the upper half of the lens is covered, the intensity of the image will decrease. This is because the blocked half of the lens reduces the amount of light passing through, resulting in a dimmer image on the screen.
Therefore, the correct answer is option 'C' - the intensity of the image will decrease when the upper half of the lens is covered by an opaque screen.
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A converging lens is used to form an image on a screen. When the upper half of the lens is covered by an opaque screena)half of the image will disappearb)complete image will disappearc)intensity of image will decreased)intensity of image will increaseCorrect answer is option 'C'. Can you explain this answer?
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