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Image Formation by Concave Lens

An object of ...

Question

An object of $10 c m$ is placed at a distance of $20 c m$ from a lens of focal length $25 c m$ . The object is placed erect on the principal axis of the lens yet a crooked image was formed.
Explain why.

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Solution

The size of the object is large enough to be comparable to the lens's aperture, so it deviates from following the ideal lens formula and hence we get a crooked image.

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