The diagram shows a mirror system. If after two reflections the ima...

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The diagram shows a mirror system. If after two reflections the image and the object \( \mathrm{O} \) coincide with each other, then find the value of radius of curvature of the concave mirror in meter. Take \( \mathrm{a}=3 \mathrm{~m} \).
\( \mathrm{P} \)
\( \mathrm{W} \)
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