The pin-hole camera produces a less sharply defined image when the
- A. Pin hole is larger
- B. Illumination is less
- C. Screen is further from the pin-hole
- D. Object is further from the pin-hole
A pin-hole camera is an old camera device which consists of a light-proof box with a small hole serving as the aperture. As light rays from a distant object enters the dark box through the pin hole, an inverted image is formed on the screen
Now, the smaller the size of the pin hole, the sharper the image formed provided the hole is open enough to allow light rays in.
So, the larger the pin hole, the less sharp the image becomes.
Now for the right answer to the above question:
- Option A is correct. the larger the pin hole, the more blurred the image becomes.
- Option B is incorrect. illumination only controls clarity and not sharpness
- C is incorrect. screen distance from the pin-hole is usually manipulated to widen the scope of view and to form different sizes of the image, and not for sharpness.
- D is not the correct answer. object distance does not affect image sharpness.
You may please note these/this:
- To increase the sharpness of an image, the size of the pin-hole is usually reduced until a certain minimum threshold.
- To reduce the sharpness of same image, the size of the hole is usually increased.
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/ culled from 2019 JAMB-UTME physics question 18 /