A converging lens is used to form an image on a screen. When upper half of the lens is coveredby an opaque screen(A) Half the image will disappear(B) Complete image will be formed of same intensity(C) Half image will be formed of same intensity(D) Complete image will be formed of decreased intensity
Question
A converging lens is used to form an image on a screen. When upper half of the lens is coveredby an opaque screen(A) Half the image will disappear(B) Complete image will be formed of same intensity(C) Half image will be formed of same intensity(D) Complete image will be formed of decreased intensity
Solution
The correct answer is (D) Complete image will be formed of decreased intensity.
Here's why:
When light passes through a converging lens, it bends towards the focal point. If you cover half of the lens, light can still pass through the other half and continue to converge towards the focal point. Therefore, an image will still be formed.
However, because less light is able to pass through the lens, the intensity of the image will be decreased. This is because intensity is directly proportional to the amount of light: less light means less intensity. So, the complete image will be formed, but it will be less bright than if the entire lens was uncovered.
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