Question
The two plane mirrors in Figure $\mathrm{P} 24.7$ come together as shown. Find two images of point $A$ as viewed by an observer at $B$. Do your analysis graphically and assume the images are made by just a single reflection.
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Figure shows two plane mirrors are parallel to each other and an object $O$ placed between them. Then the distance of the first three images from the mirror $M_{2}$ will be : (in $\mathrm{cm}$ ) (a) $5,10,15$ (b) $5,15,30$ (c) $5,25,35$ (d) $5,15,25$
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Two plane mirrors make an angle of $30^{\circ}$ with each other. Locate graphically four images of a luminous point $A$ placed between the two mirrors. (See Fig. $36-6 .$ ) From A draw normals $A A^{\prime}$ and $A B^{\prime}$ to mirrors $O Y$ and $O X$, respectively, making $\overline{A^{\prime} N}=\overline{N A^{\prime \prime}}$ and $\overline{B^{\prime} P}=\overline{P B^{\prime \prime}}$. Then $A^{\prime}$ and $B^{\prime}$ are images of $A$. Next, from $A^{\prime}$ and $B^{\prime}$ draw normals to $O X$ and $O Y$, making $\overline{A^{\prime} N}=\overline{N A^{\prime \prime}}$ and $\overline{B^{\prime} P}=\overline{P B^{\prime \prime}} \therefore$ Then $A^{\prime \prime}$ is the image of $A^{\prime}$ in $O X$ and $B^{\prime \prime}$ is the image of $B^{\prime}$ in $O Y$. The four images of $A$ are $A^{\prime}, B^{\prime}, A^{\prime \prime}, B^{\prime \prime}$. Additional images also exist, for example, images of $A^{\prime \prime}$ and $B^{\prime \prime}$.
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