Duration: 2:31

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You are given following three lenses. Which two
\( \mathrm{P} \)
lenses you use as an eyepiece and as an objective to
W
construct an astronomical telescope?
\begin{tabular}{|c|c|c|}
\hline Lenses & Power & Aperture \\
\hline \( \mathrm{L}_{1} \) & \( 3 \mathrm{D} \) & \( 8 \mathrm{~cm} \) \\
\hline \( \mathrm{L}_{2} \) & \( 6 \mathrm{D} \) & \( 1 \mathrm{~cm} \). \\
\hline \( \mathrm{L}_{3} \) & \( 10 \mathrm{D} \) & \( 1 \mathrm{~cm} \) \\
\hline
\end{tabular}
(1) \( \mathrm{L}_{1} \) and \( \mathrm{L}_{2} \)
(2) \( \mathrm{L}_{2} \) and \( \mathrm{L}_{3} \)
(3) \( \mathrm{L}_{1} \) and \( \mathrm{L}_{3} \)
(4) \( \mathrm{L}_{3} \) and \( \mathrm{L}_{1} \)
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