Question

Magnification produced by bi-concave lens is always positive. Explain?

Answer 1

Answer:

Concave lens always forms virtual images, so, magnification produced by concave lens is always positive. A concave lens always forms the image smaller than the object, so \begin{align*}|m|<1\end{align*}.Feb

Answer 2

Answer:

the formula for magnification is image height divided by object height

in case of a biconcave lens the image is virtual and erect in every case so the image and object height are positive

therefore the magnification is positive