In the figure shown find the total magnification after two successive reflections first on \( M_....

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In the figure shown find the total magnification after two successive reflections first on \( M_{1} \) and then on \( M_{2} \).
\[
f=10 \mathrm{~cm} \quad f=-20 \mathrm{~cm}
\]
\( \mathrm{P} \)
(1) +1
(2) -2
(3) +2
(4) -1


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