Sir/Madam,

I want to clear my doubt regarding example 9.9 of Ncert Physics part 2. Herethe question is of combination of lenses. In case of plano concave, by lens' formula, theanswer given is v=infinity. but we have studied that in all cases of concave lens the image formed is virtual, erect and diminished and is formed between focus and the lens. Can you please clear this anomaly? Thank you.