Question

(a) define magnification by a spherical mirror and express it in term of object distance and image distance for the mirror.

(b) the magnification produced by a convex lens is -2. what is meant by this statementand also write the information regarding image obtained from it ?

Answer 1

$$\begin{gathered} \mathrm{Linear}\mathrm{magnification}\mathrm{produced}\mathrm{by}\mathrm{mirror}\mathrm{is}\mathrm{equal}\mathrm{to}\mathrm{the}\mathrm{ratio}\mathrm{of}\mathrm{image}\mathrm{distance}\mathrm{to}\mathrm{the}\mathrm{object}\mathrm{distance} \\ \mathrm{with}\mathrm{sign}\mathrm{negative}. \\ \mathrm{m}=\frac{-\mathrm{v}}{\mathrm{u}} \\ 2.\mathrm{m}=-2 \\ \mathrm{Magnification}\mathrm{is}\mathrm{larger}\mathrm{than}1\mathrm{means}\mathrm{image}\mathrm{is}\mathrm{larger}\mathrm{or}\mathrm{magnified}. \\ \mathrm{Negative}\mathrm{sign}\mathrm{shows}\mathrm{that}\mathrm{image}\mathrm{is}\mathrm{formed}\mathrm{below}\mathrm{priciple}\mathrm{axis}. \end{gathered}$$