Question

Name the lens which always forms a neutral image of an object

Answer 1

The lens which always forms a neutral image of an object is a plane mirror.The focal length of a plane glass plate is infinite.The type of lens used in an air bubble inside water is convex lens.

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Answer 2

Actually I haven't heard of the term neutral image. Buy still I think only a plane mirror forms a neutral image of an object.
If it's virtual image I suppose, then the answer is concave lens!
Thanks