A) 75 \[cm\]
B) 60 \[cm\]
C) 71 \[cm\]
D) 74 \[cm\]
Correct Answer: C
Solution :
\[{{f}_{o}}=50\ cm,\]\[{{f}_{e}}=5\ cm,\]\[D=25\ cm\] and \[{{u}_{o}}=200\ cm.\] Separation between the objective and the eye lens is \[L=\frac{{{u}_{o}}{{f}_{o}}}{({{u}_{o}}-{{f}_{o}})}+\frac{{{f}_{e}}D}{({{f}_{e}}+D)}\]\[=\frac{200\times 50}{(200-50)}+\frac{5\times 25}{(5+25)}=71\ cm\]
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