I clear II sharp III poor IV dark
Which of the above happens when the hole of a pinhole camera is diminished?
I only
II only
I and II only
III and IV only
Explanation
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If you reduce the size of the hole in a pinhole camera, option II (sharp) go happen.
Because a smaller hole reduces the amount of light entering the camera, which increases the sharpness (clarity) of the image. The light rays become more collimated (less spread out), reducing blurriness. But there’s a catch—while the image becomes sharper, it also gets darker (option IV) because less light is getting through.
So technically, the correct effects are:
Sharper (II) – Better focus, less blur
Darker (IV) – Less light passing through
But since the question is asking for one effect, "sharp" is the best pick.
e correct answer is C. I and II only.
When the hole of a pinhole camera is made smaller (diminished), the image becomes clearer (I) and sharper (II). This happens because a smaller hole reduces the amount of light entering the camera, minimizing blurring caused by overlapping light rays. However, reducing the hole too much can make the image darker, but that's not mentioned in this
it's meant to be C
reason
Step 1: Understanding the terms
First, “hole of a camera” refers to the aperture. In simple terms, this is the small opening through which light enters the camera. If you imagine a camera like a box with a tiny opening: the hole lets light in.
“Diminished” just means made smaller. So, “hole is diminished” = aperture is smaller.
Now the words in the question:
Clear → the image is easy to see, without blur.
Sharp → edges of objects are distinct, not fuzzy.
Poor → bad quality, blurry, unclear.
Dark → less light reaches the film or sensor.
Step 2: How a smaller hole affects the image
Think of a camera like a pinhole camera, very simple.
If the hole is too big, too much light comes in, and the image can be blurry because rays cross and overlap.
If the hole is smaller, light is more controlled: the image becomes sharper and clearer, because fewer rays cross in the wrong places.
But there’s a tradeoff: smaller hole = less light, so the image also becomes darker.
So if the hole is diminished:
The image becomes clear (I)
The image becomes sharp (II)
The image does not become poor, because it’s actually sharper
The image might be darker, but JAMB usually focuses on clarity and sharpness as the main effects
Step 3: Correct answer
The best answer here is C) I and II only.
The image is clear and sharp when the aperture is smaller.
B jare when the light entering is small the image is sharp but not too bright but a brighter image can be obtained when more light enters the pinhole but it'll be blurry.
When the hole of a pinhole camera is diminished (made smaller), the effects are:
Clear (I): The image becomes sharper because a smaller hole reduces the overlap of light rays from different points of the object, decreasing blur.
Sharp (II): Same reasoning—smaller hole increases sharpness.
Poor (III): This could imply reduced brightness, which is true, but in the context of image quality, it's ambiguous.
Dark (IV): Yes, a smaller hole allows less light in, so the image becomes darker.
So, the correct options are:
I (Clear)
II (Sharp)
IV (Dark)
But looking at the options:
A. I only
B. II only
C. I and II only
D. III and IV only
The best match is C. I and II only, which correctly reflects increased clarity and sharpness, although it omits darkness.
Answer: C. I and II only
