When the object is placed at infinity from a convex lens, the image is formed at:

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Pole

Infinity

Center of curvature

Principal focus

answer is D.

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Detailed Solution

When an object is placed very far from a convex lens, the rays coming from the object can be considered to be parallel to each other.
When these parallel rays are passed through the lens, they meet at the principal focus after the refraction.

Therefore, we can say that when an object is placed at infinity from a convex lens, a very small image is formed at the principal focus.

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