Question

For an object on principal axis a concave lens

always produce​

Answer 1

Answer:

A concave mirror and a converging lens will only produce an upright image if the object is located in front of the focal point. ... A concave mirror and a converging lens will only produce a real image if the object is located beyond the focal point (i.e., more than one focal length away).

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Answer 2

Answer:

For an object principal focus of a concave lens :

All the light rays after passing through the concave lens diverge and when produced backward appear to meet at a point on the principal axis of the lens . .... This point is known as principal focus of a concave lens.

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