alleryIf a convex lens is half covered with black paper, the image formed is:
AHalf the original
BInverted only above
CNothing at all
DFull image but dimmer
Answer & Solution
Correct answer: D. Full image but dimmer
1. Each point of the lens forms a complete image of the object on its own.
2. Covering half the lens blocks half the rays from each point.
3. Image still includes contributions from all object points.
4. Only the intensity (brightness) is reduced.
5. So we get the full image, but dimmer.
_Source: Selina Concise Physics ICSE Class 10, Ch 5 'Refraction through a Lens' (aplustopper.com extract)_
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